Lab · Developer tools

URL Codec

URL Codec is a free online tool that percent-encodes and decodes URLs and query strings, shows exactly what changes between encodeURIComponent and encodeURI, and turns any query string into an editable parameter table — entirely in your browser, so nothing is ever uploaded.

Encode / decode
Component = encodeURIComponent: encodes ? & = / # too — for values. Full URL = encodeURI: keeps URL structure intact, encodes only spaces and Unicode.
Query-string parameters
No parameters parsed yet — enter a URL with a query string above and press “Parse params from input”.

Values are stored decoded; “Rebuild query” joins them with encodeURIComponent as ?key=value&… into the output pane. Duplicate keys are preserved as separate rows.

Try a sample