URL Encoder / Decoder

URLs allow only a limited set of characters in each component. Spaces, ampersands, unicode letters, and symbols must be percent-encoded — replaced with a percent sign followed by two hexadecimal digits representing the byte value. A space becomes %20; an ampersand becomes %26; the letter "é" becomes %C3%A9 under UTF-8. Without encoding, special characters break query parsing and routing.

Encode mode converts readable text into a URL-safe string. Use component encoding (encodeURIComponent) for individual query values — it encodes more characters including slashes and question marks. Use full URI encoding (encodeURI) when preserving path structure matters. Decode mode reverses percent sequences back to readable text, essential for reading captured analytics URLs or debugging redirect chains.

Double-encoding is a common bug: encoding an already-encoded string produces %2520 instead of %20, breaking links. Always verify whether input is raw or pre-encoded before processing. Mixed encoding across API parameters causes intermittent failures that are hard to trace without a decoder handy.

Developers building search forms, OAuth redirect URLs, and affiliate links rely on correct encoding. Marketing teams decode long tracking URLs to verify UTM parameters. Combine with Base64 decoding when tokens appear as encoded query values in authentication flows.

Whether you are fixing a broken share link, constructing API requests with special characters, or reading encoded redirect parameters, URL encoding tools prevent the subtle errors that silently truncate query strings.