URL Encoder / Decoder

encodeURIComponent encodes every character except letters, digits, and - _ . ! ~ * ' ( ). Use it for individual query parameter values. encodeURI preserves the characters that are part of URL structure: : / ? # [ ] @ ! $ & ' ( ) * + , ; =. Use it for a complete URL that you want to keep structurally intact.

Any time you pass user-provided data in a URL query string or path: search terms with spaces or special characters, form field values, API parameters containing & or =, redirect URL parameters, internationalized characters, or email addresses. Missing encoding causes parameters to be misread or URLs to break entirely.

The unreserved characters: A–Z, a–z, 0–9, hyphen (-), underscore (_), period (.), and tilde (~). All other characters, including spaces, brackets, quotes, and non-ASCII Unicode, need to be percent-encoded when used outside their reserved URL roles.

Use encodeURIComponent (Component mode) on the inner URL. For example, to pass https://example.com/path?q=1 as a query parameter value, encode it to https%3A%2F%2Fexample.com%2Fpath%3Fq%3D1. Never use encodeURI here — it would leave : and / unencoded, causing the outer URL to misparse the parameter boundary.

Yes. Non-ASCII characters (Arabic, Chinese, accented letters, etc.) are first encoded as UTF-8 bytes and then each byte is percent-encoded. An emoji like 😀 becomes %F0%9F%98%80. Modern browsers handle this automatically in address bars, but when constructing URLs programmatically you need to encode explicitly.

Paste the percent-encoded text into the input and click Decode. The tool reverses the process: %20 becomes a space, %26 becomes &, and UTF-8 encoded sequences are converted back to their Unicode characters. Useful for reading log files, debugging API requests, or understanding redirect parameters.

No. All encoding and decoding runs locally in your browser via JavaScript. URLs and parameters you enter are never transmitted anywhere.