Encode URLs to make them safe for use in links and APIs, or decode percent-encoded URLs back to readable text.
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URL encoding converts characters that are not allowed in web addresses into a safe percent-encoded format. Spaces become %20, special characters like ampersand and equals sign are encoded to prevent them being interpreted as URL structure, and non-ASCII characters like Arabic or Chinese text are encoded as UTF-8 byte sequences.
A URL can only contain a limited set of ASCII characters. Characters outside this set — spaces, punctuation, Unicode characters — must be encoded before they appear in a URL. Without encoding, a space breaks the URL request, an ampersand in a query parameter value gets confused with the parameter separator, and non-Latin characters are unrepresentable in a URL.
API integration frequently requires URL encoding of query parameters. When building a search query URL programmatically, any user-supplied text must be URL-encoded before being appended to the URL string. Failing to encode special characters in API parameters is a common source of integration bugs. A search term containing an ampersand will be interpreted as a parameter separator, splitting the intended single value into multiple malformed parameters that produce incorrect results from the API endpoint.
URL encoding and HTML encoding serve different purposes and should not be confused. URL encoding makes arbitrary data safe for inclusion in a URL. HTML entity encoding makes arbitrary text safe for display in HTML. A URL that appears in an HTML href attribute needs both. The URL itself must be URL-encoded and the entire href attribute value must be HTML-encoded. Using the wrong encoding for the context typically produces broken links or security vulnerabilities that are difficult to diagnose.
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