URL Encoder / Decoder — Free Online Tool

Convert text to percent-encoded form or decode it back, instantly. Handy for query strings, API parameters and safe links.

Instant results — no waiting

No sign-up needed

Free forever

How it works

1Pick a mode — Encode or Decode — then type or paste text.

2Watch it convert live as you type, right in the result box.

3Copy the result with one tap, or hit Swap to reverse it.

Frequently asked questions

What does the Encode mode do to my text?

It encodes your text as a full URI component, exactly like JavaScript's encodeURIComponent: spaces become %20, and every reserved character — ? & = / # and non-ASCII characters — is converted to its percent-encoded form. This makes the text safe to use inside query strings and URL parameters.

Why does Decode fail with an error?

Decoding uses decodeURIComponent, which throws an error on malformed input — for example a lone % or an incomplete sequence like %2. If you see an error, check that every % is followed by two valid hexadecimal digits.

Is my text uploaded to a server?

No. Everything is converted with your browser's built-in encodeURIComponent and decodeURIComponent functions, so your text never leaves this page — nothing is uploaded or stored anywhere.

encodeURIComponent · decodeURIComponent · 100% local — your text never leaves this page.