What is the difference between the two modes?

Component mode (encodeURIComponent) escapes everything including : / ? & #, which is what you want for a single query value. Full-URL mode (encodeURI) preserves those reserved characters so a complete URL stays usable.

Does it handle Unicode characters?

Yes. Non-ASCII characters are encoded as their UTF-8 percent-encoded byte sequences.

Is my input sent to a server?

No. Encoding uses the browser's built-in functions and runs entirely on your device — nothing is uploaded.

URL Encoder

Percent-encode text and URLs — component or full-URL mode.

URL encoder

Percent-encode text for safe use in URLs. Choose component mode (encodeURIComponent) when encoding a single query value, or full-URL mode (encodeURI) when you want to keep an entire URL’s structure intact.

Everything runs in your browser with built-in functions — nothing is uploaded. To reverse it, use the URL decoder.