URL Encoder & Decoder

URL encoding (percent encoding) converts characters that are not allowed or have special meaning in URLs into a percent sign followed by two hexadecimal digits. For example, a space becomes %20 and an ampersand becomes %26. This ensures that URLs can be transmitted correctly over the internet without ambiguity.

• URL component (encodeURIComponent) - Encodes all characters except letters, digits, and the characters - _ . ! ~ * ' ( ). This is the right choice for encoding individual query parameter values, such as a search term or a URL being passed as a parameter.
• Full URL (encodeURI) - Encodes all characters except those that are valid parts of a URL (it preserves : / ? & = # @ etc.). Use this when you want to encode a complete URL without breaking its structure.
• Form data - Like encodeURIComponent but replaces spaces with + instead of %20. This is the application/x-www-form-urlencoded format used in HTML form submissions.

• Encoding a search query to include in a URL: use URL component encoding.
• Passing a full URL as a query parameter: use URL component encoding on the inner URL.
• Decoding a percent-encoded API response: use URL component decoding.
• Preparing form data for HTTP POST: use form encoding.

A decoding error occurs when the input contains a malformed percent-encoded sequence, such as %GG (invalid hex digits) or a lone % sign. This tool will report the error and explain the cause. Fix the input by correcting or removing the invalid sequence.

All encoding and decoding uses the browser's built-in encodeURIComponent, decodeURIComponent, encodeURI, and decodeURI functions. Nothing is sent to any server.