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URL Encoder/Decoder

Encode or decode URLs with three distinct encoding strategies: encodeURI (preserves URL structure), encodeURIComponent (escapes reserved characters for use in query parameters), and application/x-www-form-urlencoded (spaces become +). Decode mode handles both conventions.

Features

Frequently Asked Questions

What's the difference between encodeURI and encodeURIComponent?
encodeURI preserves URL-structural characters like :, /, ?, #, and & — use it on a full URL. encodeURIComponent escapes those characters too, so it's safe for query-string values or path segments you want to inject into a URL.
When should I use form-urlencoded encoding?
Use it when building application/x-www-form-urlencoded bodies for HTML form submissions or POST requests. It's identical to encodeURIComponent except spaces become + instead of %20.
Which characters stay unescaped?
Unreserved characters A-Z, a-z, 0-9, and - _ . ~ are never percent-encoded. encodeURI additionally keeps reserved URI delimiters (:/?#[]@!$&'()*+,;=) intact.