What is URL Encoder & Decoder?
URL Encoder & Decoder converts text strings to and from percent-encoded URL string format according to RFC 3986 standards. Reserved URL characters (such as ?, &, =, /, :, #) must be percent-encoded (%20 for space, %26 for &) when passed inside URL query parameters to prevent parsing errors.
How to use URL Encoder & Decoder
Select 'Encode' or 'Decode'. Paste your URL or query parameter string into the input box to process it in real time. Select between encodeURI (preserves full URL structure) and encodeURIComponent (encodes all special characters). Copy the output.
Key features
- Bi-directional URL percent encoding and decoding
- Supports encodeURI and encodeURIComponent encoding modes
- Full UTF-8 character set support
- 100% private browser client-side execution
Common use cases
- Encoding query parameter values containing spaces, ampersands, or special symbols
- Decoding obfuscated URL parameters in tracking links or OAuth callbacks
- Preparing clean URLs for REST API GET requests
Technical details & standards
The tool uses encodeURIComponent and decodeURIComponent native functions combined with UTF-8 character encoding handling. All processing operates 100% client-side inside your browser runtime.
Frequently asked questions
What is the difference between encodeURI and encodeURIComponent?
encodeURI preserves protocol and domain syntax (:, /, ?, #), whereas encodeURIComponent encodes ALL special characters for safe usage as a parameter value.
Is my data safe?
All processing happens entirely in your browser. Your data never leaves your device and is never sent to or stored on a server.
Does it work offline?
Yes. Once the page has loaded, most tools keep working without an internet connection.