Gera Tools
Fast, private browser tools. Your files never leave your device.
Free, fast, no signup. Every tool runs entirely in your browser — your files never leave your device.
HEIC to JPG / PNG / WebP Converter
Convert iPhone HEIC photos to JPG, PNG or WebP — right in your browser.
Online Timer, Stopwatch & Pomodoro
A countdown timer, stopwatch and Pomodoro focus timer in one tab.
QR Code Generator
Create custom QR codes for URLs, text and more — download as PNG or SVG.
Image Compressor
Shrink JPG, PNG and WebP images without uploading them.
JSON Formatter & Validator
Pretty-print, minify and validate JSON instantly.
Regex Tester with Plain-English Explainer
Test regular expressions live and see them explained in plain English.
UK Mortgage Calculator
Work out monthly repayments, total interest and overpayment savings.
VAT & Sales Tax Calculator
Add or remove VAT, GST or sales tax for any country.
Compound Interest & Savings Calculator
Project savings growth with regular deposits and compound interest.
Loan & Personal Credit Calculator
Monthly payment, total cost of credit and representative APR.
Percentage Calculator
Every percentage calculation — of, is-what-%, change and reverse.
Tip Calculator & Bill Splitter
Split the bill, add a tip, round up and share the result.
Take-Home Pay & Salary Tax Calculator
Net salary after income tax and social contributions — UK, US, Germany.
Currency Converter
Convert between major currencies with live exchange rates.
Georgia (GEL) Salary & Take-Home Pay Calculator
Net salary after Georgia's flat 20% income tax and 2% pension.
Indonesia NIK (KTP) Decoder
Decode a 16-digit Indonesian NIK — province, date of birth and gender.
JAMB / Post-UTME / WAEC Aggregate Score Calculator
Work out your Nigerian university aggregate from JAMB, Post-UTME and O'level.
Password Generator
Secure passwords and passphrases — generated entirely in your browser.
UK Statutory Entitlement Calculator (Maternity, Redundancy, Notice)
Work out Statutory Maternity Pay, redundancy pay and notice using 2025/26 rates.
Unit Converter
Convert length, weight, temperature, volume, area and speed instantly.
Kenya Payslip & Net Pay Calculator (PAYE, SHIF, NSSF, Housing Levy)
Net pay after PAYE, SHIF, NSSF and the Affordable Housing Levy, explained.
Word & Character Counter
Instant word, character, sentence and reading-time counts as you type.
Age Calculator
Your exact age in years, months and days — plus next-birthday countdown.
BMI / BMR / TDEE Calculator
Body mass index, basal metabolic rate and daily calorie needs in one tool.
Discount & Sale Price Calculator
Find the sale price, work out % off, or combine multiple stacked discounts.
Pregnancy Due Date Calculator
Estimated due date, gestational age and trimester from your last period.
Fuel Cost Calculator
Calculate trip fuel cost in miles/mpg or km/L per 100km, with cost splitting.
India PAN Card Decoder — Validate & Decode Your PAN
Decode every segment of an Indian PAN — holder type, name initial, and series.
Pakistan Salary Income Tax Calculator (FY 2024-25)
Monthly take-home after Pakistan income tax — salaried slabs for FY 2024-25.
Brazil MEI DAS Calculator — Monthly Simples Nacional Payment (2025)
Calcule o DAS mensal do MEI por tipo de atividade — valores fixos 2025.
EXIF Viewer & Metadata Stripper — See & Remove Hidden Photo Data
Read camera, date and GPS data buried in your photo — then strip it before sharing.
Favicon Generator
Create favicon PNGs in all sizes — 16 to 512 px — right in your browser.
GPA Calculator
Calculate your GPA — US 4.0, UK Honours, or India 10-point CGPA.
Cron Expression Explainer
Translate any cron expression into plain English — and build your own.
Color Converter + WCAG Contrast Checker
Convert hex, RGB, and HSL colours instantly — and check WCAG contrast ratios.
JWT Decoder
Decode any JSON Web Token instantly — header, payload, and timestamps.
Mexico RFC & CURP Decoder + ISR Net Pay Calculator (2024)
Decode your RFC or CURP and see your take-home pay after ISR — all in your browser.
Bangladesh Income Tax Calculator (FY 2024-25, NBR)
আয়কর হিসাব করুন — calculate your Bangladesh income tax instantly.
India GST Calculator — All Rate Slabs (5%, 12%, 18%, 28%)
Add or extract GST at any slab rate, split into CGST/SGST or IGST instantly.
Number to Words Converter — Western & Indian (Lakh/Crore) System
Convert any number to English words in Western or Indian (lakh/crore) format instantly.
Saudi Arabia & UAE VAT Calculator (GCC) — Arabic RTL Friendly
Add or extract VAT for Saudi Arabia, UAE, Bahrain and Oman — with Arabic RTL layout.
Australia GST Calculator (Goods and Services Tax) 2025
Add or extract Australia Goods and Services Tax at 10% — instant result in your browser.
Austria USt Calculator (Umsatzsteuer) 2025
Add or extract Austria Umsatzsteuer at 20% — instant result in your browser.
Belgium BTW/TVA Calculator (Belasting over de Toegevoegde Waarde) 2025
Add or extract Belgium Belasting over de Toegevoegde Waarde at 21% — instant result in your browser.
Canada GST Calculator (Goods and Services Tax) 2025
Add or extract Canada Goods and Services Tax at 5% — instant result in your browser.
Czech Republic DPH Calculator (Daň z přidané hodnoty) 2025
Add or extract Czech Republic Daň z přidané hodnoty at 21% — instant result in your browser.
Denmark Merværdiafgift Calculator (Moms) 2025
Add or extract Denmark Moms at 25% — instant result in your browser.
Egypt VAT Calculator (Value Added Tax) 2025
Add or extract Egypt Value Added Tax at 14% — instant result in your browser.
Finland ALV Calculator (Arvonlisävero) 2025
Add or extract Finland Arvonlisävero at 25.5% — instant result in your browser.
France TVA Calculator (Taxe sur la Valeur Ajoutée) 2025
Add or extract France Taxe sur la Valeur Ajoutée at 20% — instant result in your browser.
Germany MwSt Calculator (Mehrwertsteuer) 2025
Add or extract Germany Mehrwertsteuer at 19% — instant result in your browser.
Ghana VAT Calculator (Value Added Tax) 2025
Add or extract Ghana Value Added Tax at 15% — instant result in your browser.
Greece ΦΠΑ / FPA Calculator (Φόρος Προστιθέμενης Αξίας) 2025
Add or extract Greece Φόρος Προστιθέμενης Αξίας at 24% — instant result in your browser.
Hungary ÁFA Calculator (Általános Forgalmi Adó) 2025
Add or extract Hungary Általános Forgalmi Adó at 27% — instant result in your browser.
Ireland VAT Calculator (Value Added Tax) 2025
Add or extract Ireland Value Added Tax at 23% — instant result in your browser.
Italy IVA Calculator (Imposta sul Valore Aggiunto) 2025
Add or extract Italy Imposta sul Valore Aggiunto at 22% — instant result in your browser.
Kenya VAT Calculator (Value Added Tax) 2025
Add or extract Kenya Value Added Tax at 16% — instant result in your browser.
Malaysia SST Calculator (Sales and Services Tax) 2025
Add or extract Malaysia Sales and Services Tax at 8% — instant result in your browser.
Mexico IVA Calculator (Impuesto al Valor Agregado) 2025
Add or extract Mexico Impuesto al Valor Agregado at 16% — instant result in your browser.
Netherlands BTW Calculator (Belasting over de Toegevoegde Waarde) 2025
Add or extract Netherlands Belasting over de Toegevoegde Waarde at 21% — instant result in your browser.
New Zealand GST Calculator (Goods and Services Tax) 2025
Add or extract New Zealand Goods and Services Tax at 15% — instant result in your browser.
Nigeria VAT Calculator (Value Added Tax) 2025
Add or extract Nigeria Value Added Tax at 7.5% — instant result in your browser.
Norway MVA Calculator (Merverdiavgift) 2025
Add or extract Norway Merverdiavgift at 25% — instant result in your browser.
Poland VAT Calculator (Podatek od Towarów i Usług) 2025
Add or extract Poland Podatek od Towarów i Usług at 23% — instant result in your browser.
Portugal IVA Calculator (Imposto sobre o Valor Acrescentado) 2025
Add or extract Portugal Imposto sobre o Valor Acrescentado at 23% — instant result in your browser.
Romania TVA Calculator (Taxa pe Valoarea Adăugată) 2025
Add or extract Romania Taxa pe Valoarea Adăugată at 19% — instant result in your browser.
Singapore GST Calculator (Goods and Services Tax) 2025
Add or extract Singapore Goods and Services Tax at 9% — instant result in your browser.
South Africa VAT Calculator (Value Added Tax) 2025
Add or extract South Africa Value Added Tax at 15% — instant result in your browser.
Spain IVA Calculator (Impuesto sobre el Valor Añadido) 2025
Add or extract Spain Impuesto sobre el Valor Añadido at 21% — instant result in your browser.
Sweden Moms Calculator (Mervärdesskatt) 2025
Add or extract Sweden Mervärdesskatt at 25% — instant result in your browser.
Switzerland MWST Calculator (Mehrwertsteuer) 2025
Add or extract Switzerland Mehrwertsteuer at 8.1% — instant result in your browser.
Turkey KDV Calculator (Katma Değer Vergisi) 2025
Add or extract Turkey Katma Değer Vergisi at 20% — instant result in your browser.
Arizona Sales Tax Calculator 2025 — 5.6% State Rate
Add or remove Arizona sales tax at the 5.6% statewide base rate — instant result in your browser.
California Sales Tax Calculator 2025 — 7.25% State Rate
Add or remove California sales tax at the 7.25% statewide base rate — instant result in your browser.
Colorado Sales Tax Calculator 2025 — 2.9% State Rate
Add or remove Colorado sales tax at the 2.9% statewide base rate — instant result in your browser.
Florida Sales Tax Calculator 2025 — 6% State Rate
Add or remove Florida sales tax at the 6% statewide base rate — instant result in your browser.
Georgia Sales Tax Calculator 2025 — 4% State Rate
Add or remove Georgia sales tax at the 4% statewide base rate — instant result in your browser.
Illinois Sales Tax Calculator 2025 — 6.25% State Rate
Add or remove Illinois sales tax at the 6.25% statewide base rate — instant result in your browser.
Indiana Sales Tax Calculator 2025 — 7% State Rate
Add or remove Indiana sales tax at the 7% statewide base rate — instant result in your browser.
Maryland Sales Tax Calculator 2025 — 6% State Rate
Add or remove Maryland sales tax at the 6% statewide base rate — instant result in your browser.
Massachusetts Sales Tax Calculator 2025 — 6.25% State Rate
Add or remove Massachusetts sales tax at the 6.25% statewide base rate — instant result in your browser.
Michigan Sales Tax Calculator 2025 — 6% State Rate
Add or remove Michigan sales tax at the 6% statewide base rate — instant result in your browser.
Minnesota Sales Tax Calculator 2025 — 6.875% State Rate
Add or remove Minnesota sales tax at the 6.875% statewide base rate — instant result in your browser.
New York Sales Tax Calculator 2025 — 4% State Rate
Add or remove New York sales tax at the 4% statewide base rate — instant result in your browser.
New Jersey Sales Tax Calculator 2025 — 6.625% State Rate
Add or remove New Jersey sales tax at the 6.625% statewide base rate — instant result in your browser.
North Carolina Sales Tax Calculator 2025 — 4.75% State Rate
Add or remove North Carolina sales tax at the 4.75% statewide base rate — instant result in your browser.
Ohio Sales Tax Calculator 2025 — 5.75% State Rate
Add or remove Ohio sales tax at the 5.75% statewide base rate — instant result in your browser.
Pennsylvania Sales Tax Calculator 2025 — 6% State Rate
Add or remove Pennsylvania sales tax at the 6% statewide base rate — instant result in your browser.
Tennessee Sales Tax Calculator 2025 — 7% State Rate
Add or remove Tennessee sales tax at the 7% statewide base rate — instant result in your browser.
Texas Sales Tax Calculator 2025 — 6.25% State Rate
Add or remove Texas sales tax at the 6.25% statewide base rate — instant result in your browser.
Virginia Sales Tax Calculator 2025 — 5.3% State Rate
Add or remove Virginia sales tax at the 5.3% statewide base rate — instant result in your browser.
Washington Sales Tax Calculator 2025 — 6.5% State Rate
Add or remove Washington sales tax at the 6.5% statewide base rate — instant result in your browser.
Bolivia Income Tax Calculator 2025 — 13% Flat Rate
Calculate your Bolivia take-home pay under the 13% flat income tax — monthly or annual, instant result in your browser.
Bosnia and Herzegovina Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Bosnia and Herzegovina take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Bulgaria Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Bulgaria take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Estonia Income Tax Calculator 2025 — 20% Flat Rate
Calculate your Estonia take-home pay under the 20% flat income tax — monthly or annual, instant result in your browser.
Hungary Income Tax Calculator 2025 — 15% Flat Rate
Calculate your Hungary take-home pay under the 15% flat income tax — monthly or annual, instant result in your browser.
Kazakhstan Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Kazakhstan take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Mongolia Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Mongolia take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
North Macedonia Income Tax Calculator 2025 — 10% Flat Rate
Calculate your North Macedonia take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Romania Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Romania take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Russia Income Tax Calculator 2025 — 13% Flat Rate
Calculate your Russia take-home pay under the 13% flat income tax — monthly or annual, instant result in your browser.
Turkmenistan Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Turkmenistan take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Acres to Hectares Converter
Convert ac to ha instantly — 1 ac = 0.4046856422 ha. Free, browser-only tool.
Acres to Square Metres Converter
Convert ac to m² instantly — 1 ac = 4046.856422 m². Free, browser-only tool.
Bar to PSI Converter
Convert bar to psi instantly — 1 bar = 14.50377378 psi. Free, browser-only tool.
Bytes to Kilobytes Converter
Convert B to KB instantly — 1 B = 0.001 KB. Free, browser-only tool.
Celsius to Fahrenheit Converter
Convert °C to °F instantly — °F = °C × 1.8 + 32. Free, browser-only tool.
Celsius to Kelvin Converter
Convert °C to K instantly — K = °C + 273.15. Free, browser-only tool.
Centimetres to Inches Converter
Convert cm to in instantly — 1 cm = 0.3937007874 in. Free, browser-only tool.
US Cups to Millilitres Converter
Convert cup to mL instantly — 1 cup = 236.5882365 mL. Free, browser-only tool.
Fahrenheit to Celsius Converter
Convert °F to °C instantly — °C = °F × 0.5555555556 − 17.77777778. Free, browser-only tool.
Feet to Metres Converter
Convert ft to m instantly — 1 ft = 0.3048 m. Free, browser-only tool.
US Gallons to Litres Converter
Convert gal to L instantly — 1 gal = 3.785411784 L. Free, browser-only tool.
Gigabytes to Megabytes Converter
Convert GB to MB instantly — 1 GB = 1000 MB. Free, browser-only tool.
Gigabytes to Terabytes Converter
Convert GB to TB instantly — 1 GB = 0.001 TB. Free, browser-only tool.
Grams to Ounces Converter
Convert g to oz instantly — 1 g = 0.03527396198 oz. Free, browser-only tool.
Hectares to Acres Converter
Convert ha to ac instantly — 1 ha = 2.471053815 ac. Free, browser-only tool.
Inches to Centimetres Converter
Convert in to cm instantly — 1 in = 2.54 cm. Free, browser-only tool.
Inches to Millimetres Converter
Convert in to mm instantly — 1 in = 25.4 mm. Free, browser-only tool.
Kilobytes to Bytes Converter
Convert KB to B instantly — 1 KB = 1000 B. Free, browser-only tool.
Kilobytes to Megabytes Converter
Convert KB to MB instantly — 1 KB = 0.001 MB. Free, browser-only tool.
Kelvin to Celsius Converter
Convert K to °C instantly — °C = K − 273.15. Free, browser-only tool.
Kilograms to Pounds Converter
Convert kg to lb instantly — 1 kg = 2.204622622 lb. Free, browser-only tool.
Kilograms to Stone Converter
Convert kg to st instantly — 1 kg = 0.1574730444 st. Free, browser-only tool.
Kilometres to Miles Converter
Convert km to mi instantly — 1 km = 0.6213711922 mi. Free, browser-only tool.
Kilometres per Hour to Knots Converter
Convert km/h to kn instantly — 1 km/h = 0.5399568035 kn. Free, browser-only tool.
Kilometres per Hour to Miles per Hour Converter
Convert km/h to mph instantly — 1 km/h = 0.6213711922 mph. Free, browser-only tool.
Knots to Kilometres per Hour Converter
Convert kn to km/h instantly — 1 kn = 1.852 km/h. Free, browser-only tool.
Pounds to Kilograms Converter
Convert lb to kg instantly — 1 lb = 0.45359237 kg. Free, browser-only tool.
Litres to US Gallons Converter
Convert L to gal instantly — 1 L = 0.2641720524 gal. Free, browser-only tool.
Litres to Millilitres Converter
Convert L to mL instantly — 1 L = 1000 mL. Free, browser-only tool.
Megabytes to Kilobytes Converter
Convert MB to KB instantly — 1 MB = 1000 KB. Free, browser-only tool.
Megabytes to Gigabytes Converter
Convert MB to GB instantly — 1 MB = 0.001 GB. Free, browser-only tool.
Metres to Feet Converter
Convert m to ft instantly — 1 m = 3.280839895 ft. Free, browser-only tool.
Miles to Kilometres Converter
Convert mi to km instantly — 1 mi = 1.609344 km. Free, browser-only tool.
Millilitres to US Cups Converter
Convert mL to cup instantly — 1 mL = 0.004226752838 cup. Free, browser-only tool.
Millilitres to Litres Converter
Convert mL to L instantly — 1 mL = 0.001 L. Free, browser-only tool.
Millimetres to Inches Converter
Convert mm to in instantly — 1 mm = 0.03937007874 in. Free, browser-only tool.
Miles per Hour to Kilometres per Hour Converter
Convert mph to km/h instantly — 1 mph = 1.609344 km/h. Free, browser-only tool.
Ounces to Grams Converter
Convert oz to g instantly — 1 oz = 28.3495231 g. Free, browser-only tool.
PSI to Bar Converter
Convert psi to bar instantly — 1 psi = 0.0689475729 bar. Free, browser-only tool.
Square Feet to Square Metres Converter
Convert ft² to m² instantly — 1 ft² = 0.09290304 m². Free, browser-only tool.
Square Metres to Acres Converter
Convert m² to ac instantly — 1 m² = 0.0002471053815 ac. Free, browser-only tool.
Square Metres to Square Feet Converter
Convert m² to ft² instantly — 1 m² = 10.76391042 ft². Free, browser-only tool.
Stone to Kilograms Converter
Convert st to kg instantly — 1 st = 6.35029318 kg. Free, browser-only tool.
Terabytes to Gigabytes Converter
Convert TB to GB instantly — 1 TB = 1000 GB. Free, browser-only tool.
Base64 Encoder
Encode text to Base64 — standard or URL-safe — in your browser.
Base64 Decoder
Decode Base64 back to text — standard and URL-safe — in your browser.
URL Encoder
Percent-encode text and URLs — component or full-URL mode.
URL Decoder
Decode percent-encoded text and URLs back to readable form.
HTML Entity Encoder & Decoder
Escape and unescape HTML entities — safely, in your browser.
Hex to Text Converter
Convert hex bytes to text and text to hex — UTF-8, in your browser.
SHA-1 Hash Generator
Generate a SHA-1 hash from any text instantly — in your browser.
SHA-256 Hash Generator
Generate a SHA-256 hash from any text instantly — in your browser.
SHA-512 Hash Generator
Generate a SHA-512 hash from any text instantly — in your browser.
MD5 Hash Generator
Generate an MD5 hash from any text instantly — in your browser.
CRC-32 Checksum Generator
Compute a CRC-32 checksum from any text — hex and decimal, in your browser.
UUID v4 Generator
Generate random RFC 4122 UUID v4 identifiers in bulk.
UUID v1 Generator
Generate time-based RFC 4122 UUID v1 identifiers.
UUID v7 Generator
Generate sortable, timestamp-prefixed UUID v7 identifiers.
ULID Generator
Generate sortable, URL-safe ULID identifiers.
Nano ID Generator
Generate compact, URL-safe Nano IDs with custom length and alphabet.
Lorem Ipsum Generator
Generate placeholder lorem ipsum text by paragraphs, sentences or words.
Fake Data Generator
Generate fake names, emails and addresses as a table, JSON or CSV.
.gitignore Generator
Build a .gitignore from language, OS and editor templates.
robots.txt Generator
Generate a robots.txt with allow, disallow, crawl-delay and sitemap.
Meta Tags Generator
Generate SEO, Open Graph and Twitter Card meta tags for any page.
Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case and more.
URL Slug Generator
Turn any title into a clean, SEO-friendly URL slug.
JSON to CSV Converter
Flatten a JSON array of objects into clean CSV.
CSV to JSON Converter
Turn CSV into a clean JSON array of objects.
JSON to YAML Converter
Convert JSON into clean, readable YAML.
YAML to JSON Converter
Convert YAML config into formatted JSON.
HTTP Status Codes Reference
Every HTTP status code with its meaning — searchable and instant.
ASCII Table Reference
All 128 ASCII codes in decimal, hex, octal and binary — searchable.
MIME Types Reference
Look up the right Content-Type for any file extension — searchable.
Chmod Calculator
Tick read, write and execute boxes — get the octal chmod command.
Git Commands Cheatsheet
The everyday Git commands, grouped and searchable — copy any one.
Unix Timestamp Converter
Convert Unix epoch timestamps to dates and back — UTC, local, ISO and relative.
IP Subnet / CIDR Calculator
Work out network, broadcast, host range and mask from any IPv4 CIDR.
Text Diff Checker
Compare two blocks of text line by line and highlight every change.
WCAG Color Contrast Checker
Check text and background colors against WCAG AA and AAA contrast ratios.
CSS Specificity Calculator
Calculate the specificity of any CSS selector as an (a, b, c) score.
Reverse Text
Reverse characters, words or whole lines instantly.
Sort Lines
Sort lines alphabetically, numerically or by length.
Remove Duplicate Lines
Strip duplicate lines, keeping the first of each.
Find and Replace Text
Bulk find and replace, with optional regex.
Count Occurrences
Count how many times a word or pattern appears.
Text Repeater
Repeat any text N times with a chosen separator.
Whitespace Cleaner
Trim, collapse and tidy messy whitespace.
Palindrome Checker
Check if text reads the same forwards and backwards.
Morse Code Translator
Convert text to Morse code and decode Morse back to text.
ROT13 Converter
Encode and decode ROT13 — the letter-rotating cipher.
Caesar Cipher
Encrypt and decrypt text with a shifting Caesar cipher.
Text to Binary Converter
Convert text into UTF-8 binary, 8 bits per byte.
Binary to Text Converter
Decode binary back into readable UTF-8 text.
Upside Down Text Generator
Flip text upside down with Unicode look-alikes.
Binary to Decimal Converter
Turn any binary number into its base-10 value instantly.
Decimal to Binary Converter
Convert any whole number to binary, grouped for readability.
Decimal to Hex Converter
Convert any whole number to hexadecimal, with optional 0x prefix.
Hex to Decimal Converter
Turn any hexadecimal value into its base-10 number.
Decimal to Octal Converter
Convert any whole number to octal (base 8) instantly.
Roman Numeral Converter
Convert numbers to Roman numerals and back, both directions.
Fraction to Decimal Converter
Turn any fraction — proper, improper or mixed — into a decimal.
Decimal to Fraction Converter
Convert any decimal into its simplest fraction or mixed number.
Scientific Notation Converter
Convert between plain decimal numbers and scientific notation.
Fraction Calculator
Add, subtract, multiply and divide fractions with simplified answers.
Ratio Calculator
Simplify ratios and solve proportions like A : B = C : ?
Hex to RGB Converter
Turn any hex colour code into an RGB value instantly.
RGB to Hex Converter
Convert RGB channel values into a hex colour code.
RGB to HSL Converter
Convert RGB colour values into hue, saturation and lightness.
HSL to RGB Converter
Convert hue, saturation and lightness into RGB values.
Hex to CMYK Converter
Convert a hex colour code into CMYK for print work.
Color Name to Hex Converter
Look up the hex code for any CSS named colour.
WiFi QR Code Generator
Make a QR code that connects guests to your WiFi in one scan.
vCard QR Code Generator
Turn your contact details into a scannable digital business card.
Calendar Event QR Code Generator
Let people add your event to their calendar with one scan.
Geo Location QR Code Generator
Encode coordinates into a QR code that opens in any maps app.
Email QR Code Generator
Make a QR code that opens a prefilled email in one scan.
SMS QR Code Generator
Make a QR code that opens a prefilled text message in one scan.
Random Number Generator
Cryptographically strong random numbers in any range.
Dice Roller
Roll d4 to d100 with modifiers — fair and instant.
Coin Flip
Flip one or many coins — fair heads or tails.
Random Team Picker
Split a list of names into fair, balanced teams.
Lottery Number Picker
Generate lucky lottery numbers for any draw format.
Random Card Draw
Draw playing cards from a fair, shuffled deck.
Pomodoro Timer
Run 25/5 focus cycles with automatic breaks and a session counter.
Online Stopwatch
Start, stop and lap an accurate stopwatch with hundredths of a second.
Countdown to Date
Live countdown of days, hours, minutes and seconds to any date and time.
Online Metronome
A clickable metronome from 20 to 300 BPM with accented downbeats.
Box Breathing Timer
A guided 4-4-4-4 breathing timer with an animated visual pacer.
BMR Calculator
Your Basal Metabolic Rate with the Mifflin-St Jeor equation.
TDEE Calculator
Total Daily Energy Expenditure from BMR and activity level.
Body Fat Calculator
Estimate body fat percentage with the US Navy method.
Ideal Weight Calculator
Ideal body weight from four classic formulas.
Lean Body Mass Calculator
Lean mass and fat mass from the Boer formula.
Calorie Deficit Calculator
Find your daily calorie target for steady, safe weight loss.
Macro Calculator
Split your daily calories into protein, carbs and fat in grams.
Water Intake Calculator
Estimate how much water to drink each day for your body and activity.
Running Pace Calculator
Work out pace, finish time or distance for any run.
One Rep Max Calculator
Estimate your 1RM and training weights from a set you can do.
Sleep Cycle Calculator
Find the best bedtime or wake-up time around 90-minute cycles.
SIP Calculator
Project the future value of a monthly SIP investment.
FIRE Retirement Calculator
Find your FIRE number and how long until you reach it.
Savings Goal Calculator
How much to save each month — or how long it takes.
ROI Calculator
Return on investment, net gain and annualised ROI.
CAGR Calculator
Compound annual growth rate from start and end values.
Rule of 72 Calculator
How long money takes to double — or the rate needed.
Debt Snowball Calculator
See how fast extra payments clear your debts — snowball or avalanche.
Break-Even Calculator
Find how many units you must sell to cover your costs.
Markup vs Margin Calculator
Convert between cost, price, markup and profit margin instantly.
Inflation Calculator
See how inflation erodes the buying power of your money over time.
Net Worth Calculator
Add up your assets and liabilities to find your net worth.
Emergency Fund Calculator
Work out how big your safety net should be and when you'll reach it.
Area Calculator
Area of a rectangle, triangle, circle, trapezoid and more.
Volume Calculator
Volume of a box, sphere, cylinder, cone and more.
Circle Calculator
Radius, diameter, circumference and area from any one value.
Triangle Calculator
Area, perimeter and angles from three side lengths.
Pythagorean Theorem Calculator
Solve a² + b² = c² for the hypotenuse or a missing leg.
GCD & LCM Calculator
Find the greatest common divisor and least common multiple of any numbers.
Prime Number Checker
Check whether any number is prime — with its prime factorisation.
Mean, Median & Mode Calculator
Get the mean, median, mode, range and sum of any list of numbers.
Standard Deviation Calculator
Sample and population standard deviation, variance and mean.
Quadratic Formula Solver
Solve ax² + bx + c = 0 for real or complex roots.
Percentage Change Calculator
Work out the percentage increase or decrease between two values.
Date Difference Calculator
Days, weeks and full calendar gap between any two dates.
Business Days Calculator
Count working days between two dates, holidays excluded.
Week Number Calculator
ISO 8601 and US week number for any date.
Hours Between Times Calculator
Duration between two clock times, with break deduction.
Add or Subtract Days Calculator
Add or subtract days, weeks, months or years from a date.
Day of the Week Finder
What day of the week was — or will be — any date.
Paint Calculator
How much paint to buy for any room — walls, coats and openings.
Tile Calculator
How many tiles to buy for a floor or wall, including waste.
Flooring Calculator
How many packs of laminate, vinyl or wood flooring to buy.
Concrete Calculator
Concrete volume and number of bags for a slab or footing.
Mulch Calculator
How much mulch, bark or compost to cover a garden bed.
Brick Calculator
Estimate how many bricks a wall needs, with a waste allowance.
Gravel Calculator
Work out the volume and weight of gravel for any area.
Fence Calculator
Count the posts, panels and rails for a fence run.
BTU Air Conditioner Calculator
Size an AC unit by working out the BTU your room needs.
Roof Pitch Calculator
Convert between rise/run, angle, percent and x-in-12 pitch.
Road Trip Cost Calculator
Estimate the fuel cost of a journey and split it between passengers.
MPG to L/100km Converter
Convert miles-per-gallon to litres-per-100km and back, UK or US gallons.
EV Charging Cost Calculator
Work out the cost of charging your electric car from any % to any %.
Car Depreciation Calculator
Project a car's resale value year by year using a declining-balance rate.
Speed Distance Time Calculator
Solve for speed, distance or time from the other two values.
Grade Calculator
Add your assignments and points to get your overall grade and letter.
Final Grade Needed Calculator
Find the exact score you need on your final to hit your target grade.
CGPA to Percentage Calculator
Convert CGPA to a percentage using CBSE, VTU, or a custom multiplier.
Weighted Grade Calculator
Combine scores and category weights into a single weighted grade.
Words Per Minute Typing Test
Measure your typing speed in WPM with live accuracy tracking.
UK Degree Classification Calculator
Work out your credit-weighted average and honours classification.
Luhn Algorithm Checker
Validate any number with the Luhn (mod-10) checksum.
IBAN Validator
Check any IBAN with the ISO 13616 mod-97 algorithm.
Credit Card BIN Checker
Identify the card network from a BIN / IIN prefix.
Brazil CPF Validator
Validate a Brazilian CPF with the mod-11 check digits.
Brazil CNPJ Validator
Validate a Brazilian CNPJ with the mod-11 check digits.
Spain NIF / NIE / DNI Validator
Check the control letter of a Spanish DNI, NIE or NIF instantly.
Poland PESEL Decoder
Decode date of birth, sex and check digit from a Polish PESEL.
Romania CNP Decoder
Decode birth date, sex and county from a Romanian CNP.
South Africa ID Number Decoder
Decode birth date, gender and citizenship from a South African ID.
Chile RUT Validator
Verify a Chilean RUT/RUN verifier digit and get the correct one.
Turkey TC Kimlik No Validator
Verify the two check digits of a Turkish national ID number.
Julian to Gregorian Date Converter
Convert dates between the Julian and Gregorian calendars.
Easter Date Calculator
Find the date of Easter Sunday for any year.
Age in Weeks and Days Calculator
Convert any age or date span into weeks and days.
Leap Year Checker
Check if any year is a leap year and see why.
Day of Year Calculator
Find the ordinal day number and ISO week for any date.
Password Strength Tester
Check how strong a password really is — entropy, crack time and fixes.
Reading Time Estimator
How long any text takes to read silently and to read aloud.
Words to Number Converter
Turn a number written in English words into plain digits.
Percentage of a Number Calculator
Quickly find what a percentage of any number is.
Discount Stacking Calculator
Combine multiple discounts and see the true compounded saving.
Italy Codice Fiscale Decoder & Validator
Decode an Italian Codice Fiscale — date of birth, gender and check digit.
Germany Steuer-ID Validator (Steuerliche Identifikationsnummer)
Check an 11-digit German Steuer-ID with the official MOD 11,10 check digit.
France NIR / Numéro de Sécurité Sociale Validator
Validate a French social-security number and decode its 13-digit structure.
Netherlands BSN Validator (Burgerservicenummer)
Check a Dutch BSN with the official elfproef (11-test).
Sweden Personnummer Decoder & Luhn Validator
Decode a Swedish personnummer — date of birth, gender and Luhn check digit.
Finland HETU Decoder (Henkilötunnus)
Decode a Finnish HETU — date of birth, gender and modulo-31 control character.
Denmark CPR Number Decoder
Decode a Danish CPR (personnummer) — date of birth, gender and century.
Norway Fødselsnummer Decoder
Decode a Norwegian fødselsnummer — date of birth, gender and checksum.
Portugal NIF Validator
Validate a Portuguese NIF/NIPC and read its taxpayer type.
Ireland PPS Number Validator
Validate an Irish PPS number using the modulo-23 check letter.
Belgium National Number Decoder
Decode a Belgian Rijksregisternummer — date of birth, gender, checksum.
Pakistan CNIC Validator & Decoder
Check a 13-digit Pakistani CNIC and read its province and gender digit.
Bangladesh NID Validator
Check a 10, 13 or 17-digit Bangladesh NID and read its embedded fields.
Malaysia MyKad Decoder
Decode a 12-digit MyKad — date of birth, place of birth and gender.
Thailand National ID Validator
Validate a 13-digit Thai National ID with its official mod-11 check digit.
China Resident ID Decoder & Validator
Decode an 18-character Chinese ID and verify its ISO 7064 check character.
Vietnam CCCD Decoder
Decode a 12-digit Vietnamese CCCD — province, birth year and gender.
Nigeria NIN Validator — Check Your 11-Digit NIN Format
Validate the format of a Nigerian National Identification Number offline.
Kenya National ID Validator — Check ID Number Format
Validate the format of a Kenyan national ID number offline.
Ghana Card PIN Validator — Check GHA Number Format
Validate the GHA-NNNNNNNNN-N format of a Ghana Card PIN offline.
Egypt National ID Decoder — Date of Birth, Governorate & Gender
Decode a 14-digit Egyptian National ID — century, date of birth, governorate and gender.
Tanzania NIDA Number Validator & Decoder
Validate a 20-digit Tanzanian NIDA NIN and decode its date of birth.
Uganda NIN Validator & Decoder — Class, Gender & Birth Year
Validate a 14-character Ugandan NIN and decode its class, gender and birth-year digits.
UAE Emirates ID Decoder & Validator
Decode a 15-digit Emirates ID — country prefix, birth year and Luhn check digit.
Saudi Iqama & National ID Validator
Validate a 10-digit Saudi ID or Iqama with the official check-digit algorithm.
Israel Teudat Zehut (ID) Validator
Validate an Israeli Teudat Zehut number with the official checksum.
Morocco CIN / CNI Validator
Check a Moroccan CIN format and read the issuing-bureau region from the prefix.
Jordan National ID Validator
Check a 10-digit Jordanian National Number and read its generation marker.
Argentina CUIT / CUIL Decoder
Verify an Argentine CUIT/CUIL check digit and read its type prefix and DNI.
Colombia Cédula & NIT Validator
Check a Colombian cédula format and compute the NIT modulo-11 check digit.
Peru DNI Validator
Format-check a Peruvian DNI and compute its RENIEC verification digit.
Ecuador Cédula Validator
Validate an Ecuadorian cédula with the official modulo-10 algorithm.
Chile RUT / RUN Checker
Verify a Chilean RUT/RUN verifier digit with the modulo-11 algorithm.
US SSN Format Validator — Check Social Security Number Structure
Validate the structure of a US Social Security Number against SSA rules.
Canada SIN Validator — Social Insurance Number Check (Luhn)
Validate a Canadian Social Insurance Number with the Luhn check digit.
Australia TFN Validator — Tax File Number Checksum
Validate an Australian Tax File Number with the ATO modulus-11 checksum.
New Zealand IRD Number Validator — Check Digit Verification
Validate a New Zealand IRD number with the Inland Revenue modulus-11 check.
India Aadhaar Format Validator — Verhoeff Checksum Check
Validate the format of an Indian Aadhaar number with the Verhoeff checksum.
EU VAT Number Validator
Check the format of any EU VAT number — all 27 member-state patterns.
UK VAT Number Validator
Verify a UK VAT number's check digit with HMRC's mod-97 algorithm.
Australian ABN Validator
Check an 11-digit ABN with the ATO's mod-89 checksum algorithm.
India GSTIN Validator
Validate a 15-character GSTIN — state code, PAN and base-36 check digit.
ISBN Validator
Validate ISBN-10 and ISBN-13 check digits and convert between them.
Hijri to Gregorian Converter
Convert an Islamic (Hijri) date to the Gregorian calendar.
Hebrew Calendar Converter
Convert a Gregorian date to the Hebrew (Jewish) calendar.
Persian (Jalali) Calendar Converter
Convert between Gregorian and Persian (Solar Hijri / Jalali) dates.
Ethiopian Calendar Converter
Convert between Gregorian and Ethiopian (Ge'ez) dates.
Thai Buddhist Date Converter (BE ⇄ CE)
Convert between Gregorian dates and the Thai Buddhist Era (พ.ศ.).
Nepali Bikram Sambat Converter (BS ⇄ AD)
Convert between Gregorian dates and the Nepali Bikram Sambat calendar.
Japanese Era Converter (Gengō / 和暦)
Convert between Gregorian dates and Japanese era years (Reiwa, Heisei…).
Coptic Calendar Converter (A.M. ⇄ Gregorian)
Convert between Gregorian dates and the Coptic calendar (Anno Martyrum).
Chinese Zodiac Finder
Find your Chinese zodiac animal, element and yin-yang from your birth date.
Age in Hijri Years Calculator
Convert your birth date to the Islamic calendar and get your age in Hijri years.
Ramadan Date Estimator
Estimate the Gregorian date Ramadan begins in any year.
Diwali Date Estimator
Find the date of Diwali (Lakshmi Puja) for any year.
Vikram Samvat Converter
Convert between Gregorian (CE) and Vikram Samvat (VS) years.
Number to Words — Indian System (Lakh / Crore)
Spell any number in English using the Indian lakh and crore system.
Number to Words in Spanish (Números en Letras)
Convert any number into Spanish words — correct uno/un, cien, quinientos.
Number to Words in French (Nombres en Lettres)
Convert any number into French words — soixante-dix, quatre-vingts, cent(s).
Number to Words in Portuguese (Números por Extenso)
Convert any number into Portuguese words — cem, cento e, milhão/milhões.
UK Cheque Amount in Words (Pounds & Pence)
Convert a GBP amount into the words to write on a UK cheque.
Indian Cheque Amount in Words (Rupees & Paise)
Convert an INR amount into rupees-in-words for an Indian cheque.
Nigerian Cheque Amount in Words (Naira & Kobo)
Convert an NGN amount into naira-in-words for a Nigerian cheque.
UAE Cheque Amount in Words (Dirhams & Fils)
Convert an AED amount into dirhams-in-words for a UAE cheque.
Words to Number Converter
Convert a number written in English words back into digits.
JPG to PNG Converter
Convert JPG images to lossless PNG — right in your browser, no upload.
PNG to JPG Converter
Convert PNG images to compact JPG — in your browser, with a quality slider.
JPG to WebP Converter
Convert JPG images to smaller WebP — in your browser, with a quality slider.
PNG to WebP Converter
Convert PNG images to smaller WebP — transparency kept, in your browser.
WebP to PNG Converter
Convert WebP images to lossless PNG — transparency kept, in your browser.
WebP to JPG Converter
Convert WebP images to compact JPG — in your browser, with a quality slider.
JPG to AVIF Converter
Convert JPG photos to modern, much smaller AVIF — right in your browser.
PNG to AVIF Converter
Convert PNG images to modern AVIF — smaller files, transparency kept.
GIF to PNG Converter
Convert GIF images to lossless PNG — right in your browser.
BMP to PNG Converter
Convert uncompressed BMP bitmaps to smaller, lossless PNG.
Image to Base64 Data URI
Turn any image into a base64 data URI for HTML, CSS or Markdown.
Image Crop Tool
Crop JPG, PNG and WebP images in your browser — no upload.
Image Resize Tool
Resize images to exact pixel dimensions — locally, no upload.
Rotate & Flip Image
Rotate and mirror images in 90° steps — privately, no upload.
Image to Grayscale
Convert images to black & white or sepia — privately, no upload.
Image to PDF
Turn a JPG, PNG or WebP into a single-page PDF — no upload.
XML Formatter & Minifier
Pretty-print or minify XML right in your browser — nothing is uploaded.
YAML Formatter & Re-indenter
Normalise YAML indentation and spacing in your browser — no upload.
SQL Formatter & Beautifier
Pretty-print SQL queries in your browser — keywords on their own lines.
HTML Formatter & Minifier
Pretty-print or minify HTML in your browser — nothing is uploaded.
JSON to XML Converter
Convert JSON objects and arrays into well-formed XML.
XML to JSON Converter
Convert XML documents into clean, structured JSON.
JSON to TOML Converter
Convert JSON into clean TOML config syntax.
TOML to JSON Converter
Convert TOML config files into structured JSON.
JSON to TypeScript Interface
Generate TypeScript interfaces from a JSON sample.
JWT Claims Explainer
Decode a JWT and see what every standard claim actually means.
User-Agent Parser
Break a browser User-Agent string into browser, engine, OS and device.
MAC Address Lookup
Decode a MAC address — vendor OUI, unicast/multicast and local/universal.
DNS Record Explainer
Understand DNS record types and parse any zone-file line.
Semver Range Checker
Check whether a version satisfies an npm semver range like ^1.2.0.
Watts to Kilowatt-Hours (kWh) Calculator
Turn watts and running time into kWh — kWh = (W × hours) ÷ 1000. Free, browser-only.
Miles per Hour to Knots Converter
Convert mph to kn instantly — 1 mph = 0.868976 kn. Free, browser-only tool.
Miles to Nautical Miles Converter
Convert mi to nmi instantly — 1 mi = 0.868976 nmi. Free, browser-only tool.
Celsius to Rankine Converter
Convert °C to °Ra instantly — °Ra = °C × 1.8 + 491.67. Free, browser-only tool.
Fahrenheit to Kelvin Converter
Convert °F to K instantly — K = (°F − 32) × 5/9 + 273.15. Free, browser-only.
Joules to Calories Converter
Convert J to cal instantly — 1 cal = 4.184 J. Free, browser-only tool.
Bits to Bytes Converter
Convert bits, bytes, kbit, KB, Mbit, MB, Gbit and GB — 1 byte = 8 bits.
Download Time Calculator
Estimate how long a download takes from file size and connection speed.
Bandwidth Calculator
Estimate monthly bandwidth from page weight and visits per month.
File Size Converter
Convert B, KB, MB, GB, TB and binary KiB, MiB, GiB side by side.
Data Transfer Cost Calculator
Estimate cloud or CDN egress cost from volume, price per GB and free tier.
Simple Interest Calculator
Work out simple interest and the total amount on a deposit or loan.
APR Calculator
Find the true annual cost of a loan once fees are included.
Mortgage Overpayment Calculator
See how much interest and time a regular overpayment saves.
Rent Affordability Calculator
Check how much rent you can comfortably afford on your income.
Loan Comparison Calculator
Compare two loans side by side to find the cheaper overall deal.
Tip Percentage Table
See the tip and total for a bill across every common tip percentage at once.
Salary to Hourly Converter
Convert pay between hourly, weekly, monthly and yearly in one place.
Overtime Pay Calculator
Work out gross pay including overtime at time-and-a-half or any multiplier.
Gross to Net Pay Estimator
Estimate take-home pay from gross using your own deduction percentages.
Future Value Calculator
Project the future value of savings with regular contributions and compounding.
Pregnancy Week Tracker
See how many weeks pregnant you are, your trimester and your due date.
Calorie Burn by Activity Calculator
Estimate calories burned for any activity using MET values.
BMI Prime Calculator
Express your BMI as a ratio to the healthy-weight ceiling of 25.
Waist-to-Height Ratio Calculator
Check if your waist is less than half your height — a simple health screen.
Steps to Distance Calculator
Convert daily steps into kilometres, miles and estimated calories.
Percentage Increase / Decrease Calculator
Find the % change between two numbers, or apply a % rise or fall.
Proportion Solver (Cross-Multiplication)
Solve a/b = c/d for the missing value by cross-multiplication.
Exponent Calculator (Power Calculator)
Raise any base to any power — including negative and fractional exponents.
Logarithm Calculator (log, ln, log₂, any base)
Compute log base 10, natural log, log base 2 or any custom base.
Factorial Calculator (n!)
Compute exact factorials of any non-negative integer with BigInt.
Modulo Calculator (Remainder)
Find a mod n — both the truncated and floored remainder conventions.
Work Hours Calculator
Add up a weekly timesheet — daily hours, breaks and optional gross pay.
Time Duration Adder
Add and subtract hours, minutes and seconds across a list of durations.
Time Zone Meeting Planner
Pick a meeting time in one zone and see it across cities worldwide.
Days Until a Date
Count how many days are left until any date — or how many have passed.
Weeks Between Two Dates
Count the number of weeks (and leftover days) between any two dates.
Remove Line Breaks
Join hard-wrapped lines back into flowing text.
Add Line Numbers
Prefix every line with a sequential number.
Extract Emails from Text
Pull every email address out of any text.
Extract URLs from Text
Pull every link out of any text.
JSON Escape / Unescape
Encode text into a JSON string or decode it back.
Text Statistics
Counts, sentences, paragraphs and reading time.
Random PIN Generator
Generate secure random numeric PINs of any length, right in your browser.
Pronounceable Password Generator
Create strong passwords you can actually say and remember.
API Key Generator
Generate secure random API keys in hex, base62 or base64url, with an optional prefix.
htpasswd Generator
Create Apache/Nginx .htpasswd entries with APR1 (MD5) or SHA-1 hashing.
Random Username Generator
Generate memorable usernames from random adjectives and nouns.
CSS Gradient Generator
Build linear and radial CSS gradients with a live preview and copy-ready code.
Color Shades & Tints Generator
Generate tints, shades and a full tonal scale from any base colour.
Complementary Color Finder
Find complementary, analogous, triadic and tetradic colour harmonies.
Color Blindness Simulator
See how a colour looks with protanopia, deuteranopia and tritanopia.
Random Color Palette Generator
Generate harmonious 5-colour palettes with copy-ready hex and CSS.
Code 128 Barcode Generator
Create scannable Code 128 barcodes from text or numbers in your browser.
Stopwatch with Lap Timer
An accurate online stopwatch that records lap and split times.
World Clock — Multiple Cities
See the current time across multiple cities and time zones at once.
Unit Price Comparison Calculator
Compare price per unit across pack sizes to find the best value.
PNG to ICO Converter
Turn a PNG into a multi-size Windows .ico favicon — in your browser.
JPG to ICO Converter
Turn a JPG into a multi-size Windows .ico icon — in your browser.
SVG to PNG Converter
Rasterise SVG vector files to crisp PNG at any size — in your browser.
SVG to JPG Converter
Rasterise SVG vector files to compact JPG at any size — in your browser.
GIF to WebP Converter
Convert GIF images to smaller WebP — in your browser, with a quality slider.
AVIF to JPG Converter
Convert modern AVIF images to widely-compatible JPG — in your browser.
HEIC to PNG Converter
Convert iPhone HEIC photos to lossless PNG — right in your browser.
HEIC to WebP Converter
Convert iPhone HEIC photos to compact WebP — right in your browser.
WebP to GIF Converter
Convert WebP images to GIF — entirely in your browser, no upload.
TIFF to JPG Converter
Convert TIFF images to JPG — decoded and encoded in your browser.
AVIF to PNG Converter
Convert AVIF images to lossless PNG — transparency kept, in your browser.
Image Watermark Adder
Add a text watermark to photos — right in your browser.
Blur & Redact Image
Blur or black-box sensitive parts of an image privately.
Color Picker from Image
Click any pixel to grab its HEX and RGB color.
Photo Border Adder
Add a clean solid-color border around any photo.
Flip & Mirror Image
Mirror a photo horizontally or vertically instantly.
CSV to TSV Converter
Convert comma-separated values to tab-separated values.
TSV to CSV Converter
Convert tab-separated values to proper RFC 4180 CSV.
JSON to SQL INSERT Generator
Turn a JSON array of objects into SQL INSERT statements.
CSV to SQL INSERT Generator
Turn a CSV file into SQL INSERT statements.
JSON String Escape / Unescape
Escape text into a JSON string literal, or unescape it back.
RGB to HSV Converter
Convert RGB colour values into hue, saturation and value.
CMYK to RGB Converter
Convert print CMYK percentages into screen RGB values.
Hex to HSL Converter
Convert a hex colour code into hue, saturation and lightness.
RGBA to Hex Converter
Convert RGBA colour with alpha into an 8-digit hex code.
HSV to RGB Converter
Convert hue, saturation and value into RGB colour values.
JavaScript Minifier
Strip comments and whitespace to shrink your JS.
CSS Minifier
Compress stylesheets by stripping comments and whitespace.
HTML Minifier
Shrink HTML by removing comments and collapsing whitespace.
JSON Minifier
Compact JSON to a single line and validate it.
JSON Diff Tool
Compare two JSON documents and see what changed.
Glob Pattern Tester
Test glob patterns against a list of paths in real time.
JSON to Go Struct
Generate Go structs with json tags from a JSON sample.
JSON to Zod Schema
Generate a Zod validation schema from a JSON sample.
Base64 to Image
Decode a Base64 string or data URI back into a viewable image.
CSS Flexbox Cheatsheet
Every flexbox property, grouped and searchable — copy any one-liner.
CSS Grid Cheatsheet
Every CSS grid property, grouped and searchable — copy any one-liner.
Linux Commands Cheatsheet
The everyday Linux terminal commands, grouped and searchable — copy any one.
Docker Commands Cheatsheet
The everyday Docker commands, grouped and searchable — copy any one.
SQL Cheatsheet
The everyday SQL statements, grouped and searchable — copy any one.
Keyboard Shortcuts Reference
Essential macOS and Windows keyboard shortcuts, side by side and searchable.
Pig Latin Translator
Turn English into Pig Latin instantly, in your browser.
Zalgo Text Generator
Create glitchy, corrupted Zalgo text you can copy anywhere.
Fancy Unicode Text Generator
Bold, italic, script and more — copy-paste fancy fonts.
Anagram Solver & Checker
Check if two words are anagrams, or list every letter arrangement.
Extract Numbers from Text
Pull every number out of any text.
Line Counter
Count total, non-empty, blank and unique lines.
Add Prefix / Suffix to Lines
Add text to the start or end of every line.
Text Frequency Analyzer
Count how often each word or character appears.
Crypto Address QR Code Generator
Turn a wallet address into a scannable QR code for fast payments.
Phone Number QR Code Generator
Make a QR code that dials a number with one scan.
App Link QR Code Generator
Turn an App Store or Play Store link into a scannable QR code.
PayPal.Me QR Code Generator
Make a QR code that opens your PayPal.Me payment page.
Random Name Generator
Generate realistic random first and last names instantly.
Gamertag Generator
Generate cool gamertags and usernames with optional numbers and leetspeak.
Secret Santa Picker
Draw fair Secret Santa pairings where nobody gets themselves.
Wheel of Names Spinner
Spin a colourful wheel to pick a random name or option.
Random Quote Generator
Get a random inspirational quote with one click.
Random Color Generator
Generate random colors with HEX, RGB and HSL values.
Online Alarm Clock
Set an alarm in your browser — the tone is generated locally, no app needed.
World Clock — Multiple Time Zones
Compare the current time across any IANA time zones, side by side.
White Noise Generator
Play white, pink or brown noise — synthesised locally for focus or sleep.
Interval Timer (HIIT)
Work / rest interval timer for HIIT, Tabata and circuits — with audio cues.
VO2 Max Calculator
Estimate your VO2 max from resting HR, a Cooper run or a Rockport walk.
Blood Alcohol Content (BAC) Calculator
Estimate your BAC with the Widmark formula — never use it to decide to drive.
Waist-to-Hip Ratio Calculator
Divide waist by hip and see your WHO health-risk band.
Protein Intake Calculator
How much protein per day for maintenance, muscle gain or fat loss.
Max Heart Rate Calculator
Your maximum heart rate plus five training zones, with Karvonen support.
Debt Avalanche Calculator
Pay off debt fastest — avalanche vs snowball, with a payoff order.
Investment Return Calculator
Project the future value of an investment with regular contributions.
Rent vs Buy Calculator
Compare the long-term cost of renting versus buying a home.
Dividend Yield Calculator
Work out dividend yield and the income from your shares.
Mortgage Affordability Calculator
See how much home you can afford from your income and deposit.
2x2 Matrix Calculator
Add, subtract, multiply, and find the determinant or inverse of 2x2 matrices.
Combinations & Permutations Calculator
Compute nCr, nPr, and factorials instantly in your browser.
Prime Factorization Calculator
Break any whole number down into its prime factors instantly.
Scientific Calculator
Evaluate expressions with trig, logs, roots, powers, and factorials.
Percentage of Total Calculator
Turn a list of values into each value's share of the total.
Age in Months and Days
Find an exact age in months and days from any birth date.
Next Birthday Countdown
See how many days until your next birthday and which weekday it falls on.
What Day Was I Born
Find out which day of the week you were born on.
Number to Words in Arabic
Convert any number into Modern Standard Arabic words, in your browser.
Number to Words in Armenian
Convert any number into Eastern Armenian words, in your browser.
Number to Words in Georgian
Convert any number into Georgian words — including the base-20 system.
Number to Words in Bengali
Convert any number into Bengali (Bangla) words with lakh and crore.
Number to Words in Urdu
Convert any number into Urdu words with lakh and crore.
Number to Words in Russian
Spell any number in Russian words — instantly, in your browser.
Number to Words in German
Spell any number in German words — instantly, in your browser.
Number to Words in Italian
Spell any number in Italian words — instantly, in your browser.
Number to Words in Turkish
Spell any number in Turkish words — instantly, in your browser.
Number to Words in Chinese
Spell any number in Chinese numerals — instantly, in your browser.
Russia INN Validator
Check a Russian INN (10 or 12 digit) check digits — in your browser.
Ukraine INN Validator
Decode a Ukrainian tax number (RNOKPP) — date, gender and checksum.
Serbia JMBG Decoder
Decode a Serbian JMBG — date of birth, region, gender and checksum.
Croatia OIB Validator
Verify a Croatian OIB with the ISO 7064 MOD 11,10 check digit.
Austria SVNR Validator
Decode an Austrian social-security number — date and check digit.
Spain CIF Validator
Check the control character of a Spanish company tax ID (CIF) instantly.
Indonesia NPWP Validator
Check the structure of an Indonesian taxpayer number (NPWP) instantly.
Philippines TIN Validator
Check the structure of a Philippine tax ID number (TIN) instantly.
Switzerland AHV Validator
Check the EAN-13 check digit of a Swiss AHV / AVS number instantly.
Greece AMKA Decoder
Decode the birth date and check digit of a Greek AMKA instantly.
Running Pace Converter
Convert between min/km, min/mile, km/h and mph instantly.
Shoe Size Converter
Convert shoe sizes between US, UK, EU and foot length in mm.
Ring Size Converter
Convert ring sizes between US, UK, EU, circumference and diameter.
Clothing Size Converter
Convert clothing sizes between US, UK, EU and S/M/L.
Cooking Measurement Converter
Convert cups, tablespoons, teaspoons, ml and litres for recipes.
Grams to Kilograms Converter
Convert g to kg instantly — 1 kg = 1000 g. Free, browser-only tool.
Tonnes to Kilograms Converter
Convert t to kg instantly — 1 t = 1000 kg. Free, browser-only tool.
Yards to Meters Converter
Convert yd to m instantly — 1 yd = 0.9144 m. Free, browser-only tool.
Meters to Yards Converter
Convert m to yd instantly — 1 yd = 0.9144 m. Free, browser-only tool.
Miles to Yards Converter
Convert mi to yd instantly — 1 mi = 1760 yd. Free, browser-only tool.
Feet to Inches Converter
Convert ft to in instantly — 1 ft = 12 in. Free, browser-only tool.
Inches to Feet Converter
Convert in to ft instantly — 1 ft = 12 in. Free, browser-only tool.
Nautical Miles to Kilometers Converter
Convert nmi to km instantly — 1 nmi = 1.852 km. Free, browser-only tool.
Milliliters to Teaspoons Converter
Convert mL to US teaspoons (and back) instantly.
Milliliters to Tablespoons Converter
Convert mL to US tablespoons (and back) instantly.
Cubic Meters to Liters Converter
Convert m³ to liters (and back) instantly.
Fahrenheit to Rankine Converter
Convert °F to °Ra (and back) instantly.
Square Kilometers to Square Miles Converter
Convert km² to mi² (and back) instantly.
Oven Temperature Converter
Convert oven temperatures between °C, °F and gas mark.
Grams to Cups (Flour) Converter
Convert flour between grams and US cups by type.
Grams to Cups (Sugar) Converter
Convert sugar between grams and US cups by type.
Butter Converter
Convert butter between grams, ounces, cups, sticks and tablespoons.
Recipe Scaler
Scale a recipe up or down by servings, ingredient by ingredient.
Millilitres to Fluid Ounces Converter
Convert ml to US and UK fluid ounces, both ways.
Image to Grayscale / Black & White
Convert any photo to greyscale or pure 1-bit black and white.
Sepia Photo Filter
Give any photo a warm vintage sepia tone with adjustable intensity.
Invert Image Colors
Create a photographic negative by inverting an image's colours.
Brightness & Contrast Adjuster
Fine-tune any photo's brightness and contrast with live sliders.
Compress Image to Target Size
Shrink a photo to a target file size, e.g. under 200 KB.
Timestamp to Relative Time Converter
Turn a Unix timestamp into "3 hours ago" or "in 2 days".
Milliseconds to Time Converter
Break milliseconds into days, hours, minutes, seconds.
Epoch Milliseconds Converter
Convert between epoch milliseconds and human dates.
ISO 8601 Date Formatter
Format any date as a standards-compliant ISO 8601 string.
Time Ago Calculator
How long ago was a date — in plain language.
JSONPath Tester
Test JSONPath expressions against your JSON, live in the browser.
Regex Replace Tool
Find and replace with regular expressions and capture groups.
JWT Generator (HS256)
Sign HS256 JSON Web Tokens in your browser with Web Crypto.
NATO Phonetic Alphabet Converter
Spell any word or code in the NATO phonetic alphabet.
HAR File Viewer
Inspect a .har network capture without uploading it.
Amortization Schedule Generator
Full month-by-month payment breakdown for any loan.
Credit Card Payoff Calculator
How long to clear a card — and what the interest costs.
Lease vs Buy Calculator
Compare the true cost of leasing against buying with finance.
Salary Raise Calculator
Turn a raise percentage into real money — after inflation.
Hourly to Annual Salary Calculator
Convert an hourly rate into yearly, monthly and weekly pay.
Pregnancy Weight Gain Calculator
Check your pregnancy weight gain against IOM guidelines by week.
Dog Age Calculator
Convert your dog's age to human years by size and breed group.
Cat Age Calculator
Convert your cat's age to human years and life stage.
Child Height Predictor
Estimate a child's adult height from the parents' heights.
Calories In vs Out Calculator
See your daily calorie balance and projected weight change.
Days Alive Calculator
Find out exactly how many days you have been alive.
Age on Other Planets
See how old you would be on Mars, Jupiter and every other planet.
Countdown to New Year
Live countdown to midnight on 1 January in your local time.
Half-Birthday Calculator
Find your half-birthday — six months from the day you were born.
Time Until the Weekend
Live countdown to Saturday — how long until the weekend.
Text to Speech
Read any text aloud in your browser — pick a voice, rate and pitch.
Title Case Converter
Convert text to proper title case with smart minor-word handling.
Remove Accents & Diacritics
Strip accent marks to get plain ASCII-friendly text.
Syllable Counter
Count syllables in words and text with a per-word breakdown.
Sentence Counter
Count sentences, words and average sentence length instantly.
Capitalize Each Word
Capitalize the first letter of every word in your text.
CSS Color Shades & Tints Generator
Build shades and tints of any colour and copy them as CSS variables.
Tailwind Shade Generator
Turn one colour into a full Tailwind 50–950 palette config.
Contrast Grid Checker
WCAG contrast ratios for every colour pair in your palette, at a glance.
Monochrome Palette Generator
Build a cohesive single-hue palette from one base colour.
Analogous Color Finder
Find harmonious neighbour colours on the colour wheel.
Magic 8 Ball
Ask a question, shake the ball, get one of 20 classic answers.
Love Compatibility Calculator
Enter two names for a just-for-fun compatibility score.
Random Fact Generator
One tap for a surprising, true "did you know?" fact.
Would You Rather Picker
Endless "would you rather" dilemmas for any group.
Yes or No Oracle
Ask anything and get a clear Yes, No, or Maybe.
Braille Translator
Convert text to Unicode Braille and back, in your browser.
Leetspeak Converter
Turn text into 1337 5p34k and back, in your browser.
Binary to Emoji Converter
Encode text as playful emoji binary and decode it back.
Phonetic Spelling Generator
Spell names and codes out loud with NATO or police alphabets.
Text to ASCII Art Banner
Turn short text into big block-letter ASCII banners.
Business Card QR Code Generator
Turn your contact details into a scannable vCard QR code for your card.
Spotify Link QR Code Generator
Make a scannable QR code for any Spotify track, album or playlist.
YouTube Link QR Code Generator
Create a scannable QR code for any YouTube video, playlist or channel.
Instagram QR Code Generator
Make a scannable QR code for your Instagram profile, post or reel.
WhatsApp Click-to-Chat QR Code Generator
Make a QR code that opens a WhatsApp chat with a prefilled message.
Sales Commission Calculator
Work out commission earnings from sales and rate — instantly.
GST Inclusive / Exclusive Calculator
Add or remove GST at any rate — see net, GST and gross.
Split Bill with Tax and Tip
Split a restaurant bill evenly including tax and tip.
Fuel Economy Comparison
Compare two vehicles by annual fuel cost — MPG or L/100km.
Strong Passphrase Generator
Build memorable, high-entropy passphrases from random words.
Color From Text Hash
Turn any string into a consistent, repeatable color.
Placeholder Text by Paragraphs
Generate lorem ipsum filler text by paragraph count.
Mock JSON Generator
Generate realistic mock JSON records for users, products and posts.
Random Date Generator
Generate random dates within any range and format.
Ohm's Law Calculator
Solve V, I, R and power from any two known values.
Voltage Divider Calculator
Output voltage from two series resistors.
LED Resistor Calculator
Series resistor for an LED at the right current.
Resistor Color Code Calculator
Decode 4-band resistor colour bands to ohms.
Capacitor Code Calculator
Decode 3-digit ceramic capacitor codes to pF, nF and µF.
Parallel Resistance Calculator
Total resistance of resistors wired in parallel.
Series Resistance Calculator
Total resistance of resistors wired in series.
Power (Watts) Calculator
Electrical power from voltage, current and resistance.
Decibel (dB) Calculator
Convert a power or amplitude ratio to decibels.
Frequency & Wavelength Calculator
Convert between frequency and wavelength for any wave.
Force Calculator (F = ma)
Newton's second law — solve for force, mass, or acceleration.
Kinetic Energy Calculator
Solve KE = ½ m v² for energy, mass, or velocity.
Potential Energy Calculator
Gravitational PE = m·g·h — solve for energy, mass, or height.
Acceleration Calculator
a = (v_f − v_i) ÷ t — solve for acceleration, velocity, or time.
Density Calculator
ρ = m ÷ V — solve for density, mass, or volume.
Momentum Calculator
Momentum p = m × v and impulse J = F × t, instantly.
Work and Power Calculator
Work W = F·d·cos θ and power P = W/t or P = F·v.
Projectile Motion Calculator
Time of flight, max height and range from launch speed and angle.
Speed of Sound Calculator
Speed of sound in air at any temperature, plus travel time.
Gravitational Force Calculator
Newton's law of gravitation: F = G·m₁·m₂ / r².
Molarity Calculator
Find molarity, mass or volume from the M = n/V relationship.
Molar Mass Calculator
Molar mass of any chemical formula, with per-element breakdown.
Ideal Gas Law Calculator
Solve PV = nRT for pressure, volume, moles or temperature.
Dilution Calculator (C1V1 = C2V2)
Solve the dilution equation for any concentration or volume.
pH Calculator
Convert between pH, pOH, [H⁺] and [OH⁻] at 25 °C.
Percent Yield Calculator
Percent yield from actual and theoretical yield — or solve either.
Z-Score Calculator
Convert a value to a standard score — and back.
Confidence Interval Calculator
Mean ± margin of error at 80–99% confidence.
Correlation Calculator
Pearson r for two paired data series.
Probability Calculator
Complement, AND/OR for independent events, and Bayes.
Sample Size Calculator
How many responses you need for a survey.
Percentile Calculator
Find any percentile of a data set — or a value's rank.
PX to REM Converter
Convert pixel sizes to rem for scalable, accessible CSS.
PX to EM Converter
Convert pixels to em relative to a parent font size.
REM to PX Converter
Convert rem units back to pixels for any root font size.
Line Height Calculator
Convert between unitless line-height and pixel line boxes.
Golden Ratio Calculator
Split any length into golden-ratio segments using φ ≈ 1.618.
Modular Scale Generator
Build a harmonious type scale from a base size and ratio.
Aspect Ratio Calculator
Find a ratio and scale dimensions while keeping it locked.
Screen Resolution Checker
See your screen resolution, pixel ratio and aspect ratio live.
DPI / PPI Calculator
Pixel density from resolution and diagonal screen size.
Image Dimension Scaler
Resize image dimensions by percent or target size, ratio locked.
Viewport Size Checker
Live browser viewport size, breakpoint and scrollbar width.
Words to Pages Calculator
Convert a word count into an estimated page count.
Reading Level Checker
Flesch–Kincaid grade level and reading ease for any text.
Type Scale Generator
Build a modular typographic scale and copy the CSS.
Social Media Character Counter
Live character count against every social platform limit.
Paragraph Counter
Count paragraphs, sentences and words with averages.
Meta Title Length Checker
Check title-tag length in characters and approximate SERP pixels.
SERP Snippet Preview
Preview how your title, URL and description appear in Google results.
Keyword Density Checker
Count word frequency and density in any text to avoid keyword stuffing.
Open Graph Tag Preview
Preview your Open Graph link card and generate the meta tags.
Twitter Card Preview
Preview your X (Twitter) card and generate the twitter meta tags.
IP to Binary Converter
Convert an IPv4 address to binary, hex and decimal.
CIDR to IP Range
Expand a CIDR block to its network, broadcast and host range.
Subnet Mask Converter
Convert between CIDR prefix and dotted-decimal subnet mask.
IPv6 Expander
Expand a compressed IPv6 address to its full 8-group form.
IP Class Finder
Find the class (A–E) and scope of any IPv4 address.
HMAC Generator
Keyed-hash message authentication codes — SHA-256, SHA-384, SHA-512.
Base32 Encoder & Decoder
Encode and decode RFC 4648 Base32 — case-insensitive, A–Z and 2–7.
Base58 Encoder & Decoder
Encode and decode Base58 using the Bitcoin alphabet.
SHA3-256 Hash Generator
Generate FIPS 202 SHA3-256 (Keccak) hashes in your browser.
RIPEMD-160 Hash Generator
Generate 160-bit RIPEMD-160 hashes in your browser.
ISO Country Codes Reference
Look up ISO 3166-1 alpha-2, alpha-3 and numeric country codes.
ISO Currency Codes Reference
Look up ISO 4217 currency codes, numbers and minor units.
International Calling Codes Reference
Find the international dialling (country) code for any country.
Time Zone List Reference
Browse IANA time zone names and their UTC offsets.
ISO Language Codes Reference
Look up ISO 639-1 and 639-2 language codes and native names.
HTML Tags Reference
Every common HTML element grouped and searchable.
CSS Properties Reference
Common CSS properties grouped by purpose and searchable.
File Extensions Reference
Common file extensions and what they mean — searchable.
Port Numbers Reference
Well-known TCP and UDP ports and their services — searchable.
Emoji Shortcodes Reference
GitHub and Slack emoji shortcodes — searchable, click to copy.
BPM to Milliseconds Calculator
Turn any tempo into delay and note-length times in milliseconds.
Note Frequency Calculator
Find the exact frequency in Hz for any musical note and octave.
Guitar Tuning Reference
String-by-string note names and frequencies for common guitar tunings.
Music Interval Calculator
Transpose a frequency by any interval and see ratios in cents.
Tap Tempo
Tap along to any beat to find its tempo in BPM.
D&D Dice Roller
Roll dice notation like 2d6+3 or 4d6kh3 — fair and instant.
Initiative Tracker
Track combat turn order and HP for tabletop RPG encounters.
RPG Loot Generator
Roll treasure hoards — coins, gems and magic items by tier.
Fantasy Name Generator
Generate fantasy names for elves, dwarves, orcs and more.
Character Stat Roller
Roll D&D ability scores — 4d6 drop lowest, with modifiers.
Horsepower to Watts Converter
Convert mechanical horsepower to watts and back, instantly.
Joules to Food Calories Converter
Convert joules to nutrition-label Calories (kcal) and back.
kWh to MJ Converter
Convert kilowatt-hours to megajoules and back, exactly.
BTU to kWh Converter
Convert BTU to kilowatt-hours and back, instantly.
Calories to Joules Converter
Convert small (gram) calories to joules and back, exactly.
Degrees to Radians Converter
Convert degrees to radians instantly — rad = ° × π ÷ 180. Free, browser-only.
Radians to Degrees Converter
Convert radians to degrees instantly — ° = rad × 180 ÷ π. Free, browser-only.
Newtons to Pounds-force Converter
Convert newtons to pounds-force instantly — 1 lbf = 4.4482216 N. Free, browser-only.
Torque N·m to ft·lb Converter
Convert newton-metres to foot-pounds instantly — 1 ft·lb = 1.3558179 N·m. Free, browser-only.
Pascal to Bar Converter
Convert pascals to bar instantly — 1 bar = 100000 Pa. Free, browser-only.
Mbps to MB/s Converter
Convert internet speed in megabits to file transfer in megabytes per second.
Gbps to Mbps Converter
Convert gigabit per second link speeds to megabits per second.
Data Cap Usage Calculator
Track data used against your monthly cap and project end-of-cycle usage.
Video Bitrate Calculator
Work out video file size from bitrate and duration, or the reverse.
Storage Needed Calculator
Estimate total storage for a batch of files from count and average size.
Reverse Sales Tax Calculator
Strip VAT, GST or sales tax out of a tax-inclusive price.
Profit Margin Calculator
Gross profit, profit margin and markup from cost and price.
Cost-Plus Pricing Calculator
Set a selling price by adding a markup to your unit cost.
Hourly Rate Calculator
Convert an annual salary into an equivalent hourly rate.
Freelance Rate Calculator
Work out the hourly rate a freelancer needs to charge.
Body Surface Area Calculator
BSA in m² by Du Bois, Mosteller and Haycock formulas.
Metabolic Age Calculator
Estimate your metabolic age from your BMR.
Target Heart Rate Zone Calculator
Training zones by Karvonen or percentage of max HR.
Smoking Cost Calculator
See what smoking costs per day, month, year and beyond.
Alcohol Units Calculator
UK units and US standard drinks from volume and ABV.
Percentage Difference Calculator
Find the percentage difference between two values.
Weighted Average Calculator
Average values that carry different weights.
Slope Calculator
Slope, equation and angle of a line through two points.
Distance Between Two Points Calculator
Straight-line distance between two coordinates.
Midpoint Calculator
Find the midpoint between two coordinates.
Rounding Calculator
Round numbers to decimals, multiples or whole numbers.
Work Days Between Dates
Count the working days between two dates, weekends excluded.
Add Business Days
Add or subtract business days from a date, skipping weekends.
Quarter Calculator
Find which calendar quarter a date falls in, with start and end dates.
Fiscal Year Calculator
Find the fiscal year for any date — UK, US, Australia and more.
Moon Phase Calculator
Find the moon phase and illumination for any date.
Remove Extra Spaces
Collapse repeated spaces and tidy punctuation spacing.
Smart Quotes Converter
Swap between curly typographic quotes and straight quotes.
Unicode Character Inspector
See the code point, hex, and category of every character.
Text Column Formatter
Align delimited rows into clean monospace columns.
CSV Column Extractor
Pull selected columns out of any CSV instantly.
CSS Box Shadow Generator
Build a box-shadow with live preview and copy the CSS.
CSS Border Radius Generator
Round corners individually or together with a live preview.
CSS Text Shadow Generator
Style a text-shadow with live preview and copy the CSS.
CSS Transform Generator
Combine translate, rotate, scale and skew with a live preview.
CSS Filter Generator
Blur, brightness, contrast, grayscale, sepia and more — live preview.
CSS Clip-Path Generator
Polygon clip-path shapes — triangles, hexagons, stars and custom.
CSS Glassmorphism Generator
Frosted-glass cards with backdrop-filter blur, tint and border.
Cubic Bezier Generator
Drag the curve to craft custom cubic-bezier() easing for CSS.
CSS Animation Keyframes Generator
Fade, slide, bounce, spin and shake @keyframes with live preview.
Sphere Calculator
Volume and surface area of a sphere from its radius.
Cone Calculator
Volume, surface area and slant height of a right circular cone.
Cylinder Calculator
Volume and surface area of a right circular cylinder.
Pyramid Calculator
Volume and surface area of a rectangular-base pyramid.
Trapezoid Calculator
Area, perimeter and midsegment of a trapezoid.
Ellipse Calculator
Area, perimeter, eccentricity and axes of an ellipse.
Polygon Area Calculator
Area, perimeter and angles of any regular polygon.
Hexagon Calculator
Area, perimeter, diagonals and apothem of a regular hexagon.
Sector & Arc Calculator
Arc length, sector area and chord from radius and angle.
Rectangle Calculator
Area, perimeter and diagonal of a rectangle.
Parallelogram Calculator
Area, height, perimeter and diagonals of a parallelogram.
Right Triangle Trig Solver
Solve any right triangle from two known values — sides and angles.
Law of Cosines Calculator
Solve any triangle from three sides or two sides and an angle.
2D Vector Calculator
Add, subtract, dot, cross and find the angle between 2D vectors.
Complex Number Calculator
Add, subtract, multiply and divide complex numbers with modulus and argument.
Polynomial Roots Calculator
Find the real and complex roots of quadratic and cubic equations.
Set Operations Calculator
Union, intersection, difference and symmetric difference of two sets.
Base-N Number Converter
Convert a number between any bases from 2 to 36.
Two's Complement Calculator
Signed decimal to two's complement binary and hex.
IEEE 754 Floating-Point Converter
Decimal to IEEE 754 single and double precision bits.
Binary Arithmetic Calculator
Add, subtract, multiply, divide and bitwise on binary numbers.
Modular Exponentiation Calculator
Compute (base ^ exponent) mod modulus for huge numbers.
Depth of Field Calculator
Near, far and total depth of field for any lens and sensor.
Hyperfocal Distance Calculator
Focus point for maximum front-to-back sharpness.
Exposure Value (EV) Calculator
Compute EV and EV100 from aperture, shutter and ISO.
F-Stop Calculator
Stops difference and light change between two apertures.
FPS Timecode Calculator
Convert HH:MM:SS:FF timecode to frames and real time.
Video File Size Calculator
Estimate a video file's size from duration and bitrate.
Audio File Size Calculator
Estimate audio file size for MP3, AAC or uncompressed WAV.
Sample Rate Converter
Find the resampling ratio between two audio sample rates.
Frame Rate Converter
Convert between video frame rates and frame counts.
Bitrate Calculator (Audio + Video)
Find the bitrate needed to fit a target file size.
Weeks to Days Converter
Convert weeks to days (and back) instantly.
Days to Hours Converter
Convert days to hours (and back) instantly.
Hours to Minutes Converter
Convert hours to minutes (and back) instantly.
Minutes to Seconds Converter
Convert minutes to seconds (and back) instantly.
Years to Months Converter
Convert years to months (and back) instantly.
Months to Weeks Converter
Convert months to weeks (and back) using the average month.
Astronomical Unit Converter
Convert astronomical units (AU) to kilometers and back.
Light-Years to Kilometers Converter
Convert light-years to kilometers and back.
Parsecs to Light-Years Converter
Convert parsecs to light-years and back.
Kelvin to Fahrenheit Converter
Convert Kelvin to Fahrenheit and back.
Square Feet to Acres Converter
Convert square feet to acres and back.
Cups to Grams Rice Converter
Convert cups of rice to grams instantly — by rice type. Free, browser-only.
Tablespoons to Cups Converter
Convert tbsp to cups instantly — 1 cup = 16 tbsp. Free, browser-only tool.
US Quarts to Litres Converter
Convert qt to L instantly — 1 qt = 0.946352946 L. Free, browser-only tool.
US Pints to Millilitres Converter
Convert pt to mL instantly — 1 pt = 473.176473 mL. Free, browser-only tool.
US Gallons to Cups Converter
Convert gal to cups instantly — 1 gallon = 16 cups. Free, browser-only tool.
Fluid Ounces to Millilitres Converter
Convert fl oz to mL instantly — 1 fl oz = 29.5735 mL. Free, browser-only tool.
Base64 URL-Safe Encoder
Encode and decode Base64URL (RFC 4648 §5) for tokens and URLs.
Quoted-Printable Encoder
Encode and decode Quoted-Printable (RFC 2045) email content.
Punycode Converter
Convert between Unicode domains and Punycode (xn--) per RFC 3492.
Base85 Encoder
Encode and decode Base85 (Z85) — compact 4-byte to 5-char binary text.
ASCII85 Encoder
Encode and decode Adobe ASCII85 used in PostScript and PDF.
Vigenère Cipher Encoder & Decoder
Encrypt and decrypt text with a keyword-based Vigenère cipher.
Atbash Cipher Encoder & Decoder
Mirror the alphabet — A becomes Z, B becomes Y, all in your browser.
Rail Fence Cipher Encoder & Decoder
Zig-zag transposition cipher with a choice of rails.
Substitution Cipher Encoder & Decoder
Keyword-seeded monoalphabetic substitution, all in your browser.
A1Z26 Cipher Encoder & Decoder
Convert letters to their alphabet position — A=1, Z=26.
HTTP Headers Reference
Searchable list of common HTTP request, response, security and CORS headers.
DNS Record Types Reference
Searchable list of DNS record types — A, AAAA, CNAME, MX, TXT and more.
Regex Syntax Reference
Searchable cheat sheet of regular-expression tokens, quantifiers and flags.
Markdown Syntax Reference
Searchable cheat sheet of Markdown syntax — headings, emphasis, lists, links and code.
Vim Commands Cheat Sheet
Searchable cheat sheet of Vim commands — modes, motion, editing, search and files.
Zodiac Signs Reference
All 12 zodiac signs with dates, elements, qualities and ruling planets.
Birthstones by Month
Modern and traditional birthstones for every month, with meanings.
Anniversary Gifts by Year
Traditional and modern wedding anniversary gifts for each year.
Currency Symbols Reference
Currency symbols with ISO codes, names and countries — searchable.
Unicode Blocks Reference
Common Unicode blocks with their code-point ranges and contents.
50/30/20 Budget Calculator
Split your take-home pay into needs, wants and savings.
Zakat Calculator
Work out zakat at 2.5% on wealth above the nisab threshold.
Tithe Calculator
Calculate your tithe from gross or net income at any rate.
Change Maker Calculator
Work out change owed and the fewest notes and coins to give it.
Savings Rate Calculator
Find your savings rate and a rough years-to-FI estimate.
Refinance Break-Even Calculator
Find how long until a refinance pays for itself.
Mortgage Points Calculator
See if buying discount points is worth the up-front cost.
Coast FIRE Calculator
Find the portfolio you need today to coast to retirement.
Paycheck Budget Split
Split your pay into needs, wants and savings.
Money Counter
Add up cash by counting notes and coins.
Calories Per Meal Planner
Split your daily calorie target across meals.
Sweat Rate Calculator
Work out how much fluid you lose during exercise.
Steps to Calories Calculator
Convert your step count into calories burned.
Water Intake by Body Weight Calculator
How much water to drink based on your weight.
Blood Type Inheritance Calculator
Predict a child's possible blood types from both parents.
Period & Cycle Tracker
Predict your next period, ovulation and fertile window.
Pregnancy Trimester Calculator
Find your trimesters, due date and gestational age.
BMI-for-Age Percentile Calculator
Child & teen BMI percentile using CDC growth charts.
Body Frame Size Calculator
Small, medium or large frame from height and wrist.
Resting Metabolic Rate Calculator
Estimate your RMR and daily calorie needs.
ISO Week Number Calculator
Find the ISO 8601 week number for any date.
Julian Day Number Calculator
Convert a calendar date to its Julian Day Number, JD and MJD.
Days in Month Calculator
How many days are in any month of any year?
Weekly Time Card Calculator
Add up a week of clock-in / clock-out times and breaks.
Age Gap Calculator
Find the age difference between two people.
Countdown to Christmas
Live days, hours, minutes and seconds until Christmas Day.
Countdown to Birthday
Live countdown to your next birthday from your date of birth.
Retirement Countdown
Live countdown to the day you reach your target retirement age.
Semester Weeks Calculator
Count how many weeks a semester or term runs from start to end.
Sprint Date Calculator
Generate agile sprint start and end dates from a cadence.
Markdown Table Generator
Build aligned Markdown tables from a simple grid.
CSV to Markdown Table
Convert CSV data into a clean Markdown table.
Bulk Text to Slug Converter
Turn many titles into URL slugs at once.
Duplicate Word Finder
Find words that repeat in your text and how often.
Longest Word Finder
Find the longest words in any block of text.
Random Paragraph Generator
Generate random English paragraphs and sentences for testing and layouts.
Lorem Markdown Generator
Generate placeholder Markdown with headings, lists, quotes, code and tables.
Text Shuffler
Randomly shuffle lines, words or characters with an unbiased shuffle.
Word Wrap Tool
Wrap text to a fixed character width on word boundaries.
Strip HTML Tags
Remove all HTML tags and get clean plain text.
Test Credit Card Number Generator
Luhn-valid fake card numbers for sandbox & form testing.
Random MAC Address Generator
Valid random MAC addresses in any format — colon, hyphen, Cisco.
Random IP Address Generator
Random IPv4 & IPv6 addresses, public-only option included.
Random User Generator
Fake people with name, email, phone & address for test data.
Random Emoji Picker
Pick random emoji by category — with a no-repeats option.
Bingo Card Generator
Print random 75-ball bingo cards — B, I, N, G, O.
Sudoku Generator
Generate unique-solution sudoku puzzles — easy, medium, hard.
Maze Generator
Create printable mazes with one solution path — small to large.
Crossword Grid Maker
Design a blank crossword grid with auto clue numbering.
Word Search Generator
Hide your own words in a printable word search grid.
Name Numerology Calculator
Find the numerology numbers hidden in your name.
Lucky Number Generator
Pick lucky numbers for any range — lottery, draws or games.
Rock Paper Scissors
Play rock paper scissors against the computer — fair and instant.
Fortune Cookie
Crack a virtual fortune cookie for a message and lucky numbers.
Decision Spinner
Can''t decide? Add your options and let the spinner choose.
Color Temperature Converter (Kelvin to RGB)
Turn a Kelvin colour temperature into an approximate sRGB colour.
Pantone to Hex (Approximate)
Look up an approximate screen hex for a Pantone PMS coated colour.
Hex to Pantone (Approximate)
Find the closest Pantone PMS coated colours to any hex value.
Color Mixer (Blend Two Colors)
Blend two colours at any ratio — gamma-correct or simple sRGB.
Triadic Color Scheme Generator
Build a balanced triadic palette — three hues 120° apart.
UTM Link Builder
Build tagged campaign URLs with utm_source, utm_medium and more.
Query String Parser
Split a URL query string into decoded key/value pairs.
URL Parser
Break a URL into protocol, host, port, path, query and hash.
Slug From Title
Turn a headline into a short, clean URL slug.
Canonical URL Builder
Normalise a URL and build its rel=canonical tag.
JSON to .env Converter
Turn a JSON config object into dotenv key=value lines — in your browser.
.env to JSON Converter
Parse a dotenv file into a clean JSON object — privately in your browser.
JSON Flattener
Flatten nested JSON into single-level dot-path keys — in your browser.
JSON Unflattener
Rebuild nested JSON from flat dot-path keys — privately in your browser.
JSON Key Sorter
Sort JSON object keys alphabetically and recursively — in your browser.
SQL IN Clause Builder
Turn a list of values into a ready-to-paste SQL IN (...) clause.
CSV to HTML Table
Convert CSV into a clean, escaped HTML <table> you can paste anywhere.
HTML Table to CSV
Extract any HTML <table> into clean, properly quoted CSV.
Markdown to Jira
Convert Markdown into Jira wiki markup for tickets and comments.
Jira to Markdown
Convert Jira wiki markup back into clean Markdown.
Air Fryer Conversion Calculator
Convert any oven recipe to air fryer temperature and time.
Slow Cooker Time Converter
Convert oven or stovetop times into slow cooker Low and High times.
Meat Roasting Time Calculator
Roasting times and safe internal temperatures by weight and doneness.
Yeast Conversion Calculator
Convert between fresh, active dry and instant yeast.
Egg Size Substitution Calculator
Swap small, medium, large or jumbo eggs in any recipe.
International Shoe Size Converter
Convert shoe sizes between US, UK, EU and centimetres.
Hat Size Converter
Turn head circumference into US, UK, EU and S–XL hat sizes.
Bra Size Converter
Convert bra sizes between UK, US, EU, FR and AU/NZ.
Glove Size Converter
Convert hand circumference into numeric and S–XL glove sizes.
Belt Size Converter
Find your belt size from waist measurement in inches, cm or letters.
GPA to Letter Grade Converter
Turn a 4.0-scale GPA into its letter grade instantly.
Percentage to GPA Converter
Convert a percentage grade to a 4.0-scale GPA and letter.
Class Rank Percentile Calculator
Turn your class rank into a percentile and top-percent figure.
Attendance Percentage Calculator
Check your attendance percentage and absences left.
Exam Time Per Question Calculator
Pace your exam — how long to spend on each question.
Tip Per Person Table
One bill and tip — see each person's share for any group size.
Group Gift Splitter
Split a group gift fairly — down to the last cent.
Road Trip Time Estimator
How long will the drive really take — with rest stops added.
Parking Cost Calculator
Find the cheapest way to pay — hourly, daily cap or weekly pass.
Electricity Bill Estimator
Turn watts and hours into a daily, monthly and yearly cost.
CSS Grid Generator
Build a CSS grid layout visually and copy the code.
CSS Flexbox Playground
Experiment with flexbox properties and copy the CSS.
CSS Text Gradient Generator
Create gradient-filled text and copy the CSS.
CSS Triangle Generator
Make CSS triangles with the border trick and copy the code.
CSS Scrollbar Styler
Style custom scrollbars and copy cross-browser CSS.
CSS Variables Generator
Build a :root block of CSS custom properties and copy it.
Pentagon Calculator
Area, perimeter, diagonal and radii of a regular pentagon.
Octagon Calculator
Area, perimeter, diagonals and radii of a regular octagon.
Rhombus Calculator
Area, perimeter, diagonals and angles of a rhombus.
Regular Polygon Calculator
Area, perimeter, radii and angles for any regular n-gon.
Annulus Calculator
Area, width and circumferences of a ring between two circles.
Debt-to-Income Ratio Calculator
See your DTI ratio and where you stand with lenders.
Cap Rate Calculator
Capitalization rate from NOI and property value.
Cash-on-Cash Return Calculator
Annual cash flow as a percentage of cash invested.
Inventory Turnover Calculator
How many times you sell through stock per year.
Gross Rent Multiplier Calculator
Price relative to gross annual rent.
Marathon Time Predictor
Predict your marathon finish from a recent race using the Riegel formula.
VDOT Running Calculator
Find your VDOT fitness score from any race time (Daniels–Gilbert model).
Golf Handicap Calculator
Score differentials and Handicap Index using the World Handicap System.
Darts Checkout Calculator
Find a 1–3 dart finish for any score from 2 to 170.
Swim Pace Calculator
Work out your pace per 100 m or 100 yd and average swim speed.
Planet Weight Calculator
See how much you would weigh on every planet, the Moon and the Sun.
Escape Velocity Calculator
Work out the speed needed to escape any body's gravity.
Orbital Period Calculator
Compute how long one orbit takes with Kepler's third law.
Light Travel Time Calculator
How long light takes to cross any distance in space.
Telescope Magnification Calculator
Find your telescope magnification from focal length and eyepiece.
Crontab Expression Builder
Build and read cron schedules field by field.
CSS Color Names List
All CSS named colors with hex and RGB — searchable.
CSS Unit Converter
Convert between px, rem, em, pt, pc and physical CSS units.
HTTP Methods Reference
GET, POST, PUT and the rest — safe, idempotent, cacheable.
ASCII Control Codes Reference
The 33 ASCII control characters — abbr, caret and escape.
Scrabble Score Calculator
Add up the tile value of any word instantly.
Words With These Letters
Find every word you can spell from your tiles.
Hangman Word Picker
Pick a fair secret word for a game of hangman.
Word Unscrambler
Turn scrambled letters back into real words.
Basic Rhyme Finder
Find words that rhyme with any common word.
Eisenhower Matrix
Sort tasks into do, schedule, delegate or delete.
Time Blocking Planner
Build a back-to-back schedule of focused time blocks.
Pomodoro Estimator
Estimate how long a set of pomodoros will really take.
Weekly Goal Tracker
Track progress toward your weekly targets with live bars.
Focus Session Logger
Log focus sessions with duration and a quality rating.
Kebab Case to Camel Case Converter
Turn 'kebab-case' identifiers into 'camelCase' instantly.
Snake Case to Camel Case Converter
Turn 'snake_case' identifiers into 'camelCase' instantly.
Camel Case to Snake Case Converter
Turn 'camelCase' identifiers into 'snake_case' instantly.
Constant Case Converter
Turn any text into 'CONSTANT_CASE' for env vars and constants.
Dot Case Converter
Turn any text into 'dot.case' for keys and namespaces.
Milligrams to Grams Converter
Convert mg to g instantly — 1 g = 1000 mg. Free, browser-only tool.
Micrograms to Milligrams Converter
Convert µg to mg instantly — 1 mg = 1000 µg. Free, browser-only tool.
Centimeters to Meters Converter
Convert cm to m instantly — 1 m = 100 cm. Free, browser-only tool.
Kilometers to Meters Converter
Convert km to m instantly — 1 km = 1000 m. Free, browser-only tool.
Millimeters to Centimeters Converter
Convert mm to cm instantly — 1 cm = 10 mm. Free, browser-only tool.
Celsius to Newton Scale Converter
Convert °C to the historic Newton temperature scale, both ways.
Calories to Kilojoules Converter
Convert food calories (kcal) to kilojoules, both directions.
Kilojoules to Calories Converter
Convert kilojoules to food calories (kcal), both directions.
Miles per Gallon UK to US Converter
Convert fuel economy between UK and US miles per gallon.
Knots to MPH Converter
Convert knots to miles per hour, both directions.
Heart Rate Recovery Calculator
How fast your pulse drops after exercise.
Pace Per Kilometer Calculator
Turn distance and time into min/km, min/mile and km/h.
Cycling Power Estimator
Estimate the watts needed to ride at a given speed.
Daily Calorie Cycling Calculator
Split your weekly calories into high and low days.
Hydration Reminder Calculator
Your daily water target and a drink-every-X-minutes schedule.
Keyboard Symbols Reference
What ⌘ ⌥ ⇧ ⌃ and the other key symbols mean.
Planetary Data Reference
Diameter, mass, gravity, orbit and moons for every planet.
Greek Alphabet Reference
All 24 Greek letters with names, pronunciation and uses.
Roman Numerals Chart
Convert numbers to Roman numerals, plus a full chart.
Metric Prefixes Reference
Every SI prefix from quetta to quecto, with powers of ten.
Coin Flip Streak Simulator
Flip many coins at once and see the longest run of heads or tails.
Random Team Name Generator
Punchy two-word team names for sports, quizzes, gaming and work.
Password Entropy Calculator
Measure password strength in bits and estimated time to crack.
Batch QR Code Generator
Turn a list of notes or links into many QR codes at once.
Screen Time Cost Calculator
See how many hours and how much your daily screen time really adds up to.