URL encode & decode
Encode text so it's safe to use in a web address (percent-encoding), or decode a string full of %20 and %C3%A9. Bonus: paste a full URL and read its query parameters in a clean table.
When you need percent-encoding
Only certain characters are allowed in a URL: spaces, accented letters, "&", "?" and "#"
inside a value must be converted to their percent form (a space becomes %20,
"é" becomes %C3%A9). Skip this step and a link can break or pass the wrong
parameters — the classic bug where a search form silently drops everything after an
"&" the user typed. This tool uses encodeURIComponent, the standard JavaScript
function, so the output matches exactly what your own code would produce.
Reading a URL's query parameters
Everything after the "?" is the query string: name=value pairs separated by
"&". Real-world URLs pile up tracking parameters (utm_source,
utm_campaign, fbclid, gclid) alongside the functional ones.
The second box splits them apart and decodes each one: handy for seeing what a link tracks
before you share it, or for debugging a request without counting "&" signs by eye.