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URL encoding (percent-encoding) replaces unsafe characters in URLs with a percent sign followed by two hexadecimal digits representing the character's byte value. For example, a space becomes %20, an ampersand becomes %26, and a forward slash becomes %2F.
Why URL encoding exists: URLs can only contain a limited set of ASCII characters. Characters like spaces, quotes, angle brackets, and many Unicode characters are not allowed in URLs. Encoding makes any string safe for inclusion in a URL.
encodeURI vs encodeURIComponent — knowing the difference:
encodeURI("https://example.com/path?q=hello world") → preserves the URL structure, only encodes the spaceencodeURIComponent("hello world&more") → encodes everything including & and = → suitable for query parameter valuesThe URL parser in this tool breaks any URL into its components: protocol, host, port, pathname, query parameters (as key-value pairs), and fragment. This is invaluable for debugging complex URLs with multiple parameters.
The query string builder lets you construct properly encoded query strings from key-value pairs, handling all the encoding automatically. No more manually concatenating parameters and worrying about missing encoding.
For encoding binary data in text format, see the Base64 Encoder/Decoder. If you are working with JSON data in URLs, the JSON Formatter can help you inspect the payload structure.