URL Encode/Decode

The URL Encode/Decode tool is a free uri encoder that converts text to percent-encoded form and back, instantly and in your browser. URL encoding (percent encoding) replaces characters that aren't safe inside a URL — spaces, ampersands, question marks, slashes, non-ASCII characters — with a % sign followed by their hexadecimal byte value, so the resulting string stays a valid, unambiguous URL. It's a tool every web developer needs sooner or later, whether building links by hand or untangling one that's already broken.

Use it to url encode query-string parameters before building a link programmatically, url decode a URL you copied out of server access logs or an email tracking link, or work out why a request is failing because a value contains an unescaped & or = that's being parsed as a second parameter. It's also useful for peeling back multiple layers of encoding — some analytics and redirect systems percent-encode a URL, then encode the whole thing again, and doing that by hand is tedious and error-prone. Query strings, path segments, form submissions and redirect URLs all rely on correct encoding — get it wrong and a browser, server or API can silently misinterpret where one parameter ends and the next begins.

The tool implements full UTF-8-aware percent encoding, so accented characters, currency symbols and non-Latin scripts (Chinese, Korean, Arabic, Cyrillic) all encode and decode correctly — a common source of mojibake in hand-rolled encoding code that only handles ASCII. Malformed encoded input, like a stray % not followed by two hex digits, is caught and reported instead of throwing an opaque browser error. It also round-trips reserved characters like +, which some systems use as a legacy stand-in for a space in query strings — a frequent source of confusion when comparing two 'equivalent' encoded URLs that look different but decode to the same result.

Encoding and decoding happen instantly as you type, entirely client-side, so URLs containing session tokens or internal query parameters never leave your device.