100% Client-Side Real-Time Percent-Encoding Engine
URL Encoder & Decoder (Percent-Encoding)
Encode strings into RFC 3986 percent-encoded URL parameters or decode encoded URLs back to human-readable text.
Understanding Percent-Encoding (RFC 3986)
Why URL Encoding is Needed
URLs can only contain a limited set of ASCII characters. Special characters like spaces (%20), ampersands (%26), and question marks (%3F) must be percent-encoded to prevent URL syntax errors.
Local Processing Guarantee
All URL string transformations happen locally using standard JavaScript functions inside your browser window without making HTTP server requests.
📖 Detailed Guide & Use Cases
Encode special characters, query params, and spaces into safe RFC 3986 percent-encoded URL parameters (e.g. %20 or %2F) or decode percent-encoded URLs back to readable text.
❓ Frequently Asked Questions (FAQ)
Percent-encoding replaces unsafe ASCII characters with a % followed by two hexadecimal digits to ensure valid HTTP URLs.
Yes, switch between full URL encoding and parameter component encoding.