What is the difference between MB and MiB?

A megabyte (MB) is a decimal unit equal to 1,000,000 bytes, while a mebibyte (MiB) is a binary unit equal to 1,048,576 bytes (1024 × 1024). Storage vendors advertise in decimal MB/GB/TB, while many operating systems report binary MiB/GiB but often label them MB/GB — which is why a 1 TB drive appears as about 931 GiB.

Are these conversions accurate?

Yes. The converter uses the exact factors 1 KB = 1000 bytes (decimal) and 1 KiB = 1024 bytes (binary), and shows both systems plus the raw byte count to 6 decimal places.

Is my data sent anywhere?

No. The converter is privacy-first and runs entirely in your browser — the value you type never leaves your device.

File Size Converter — Gera Tools

File Size Converter

Convert a file size across bytes, KB, MB, GB, TB and PB (decimal/SI) and the binary KiB, MiB, GiB, TiB and PiB (IEC) units — all at once. The two systems differ by their base:

Decimal: 1 KB = 1000 bytes · Binary: 1 KiB = 1024 bytes

That gap is why a drive sold as 1 TB (1,000,000,000,000 bytes) shows up as roughly 931 GiB in your operating system. This tool computes the raw byte count once and expresses it in every unit in both systems, so you can compare a vendor’s figure with what your OS reports. Everything is calculated locally in your browser — nothing is sent anywhere.