6 min read
2026-02-28
URL encoding is essential in many web scenarios.
When sending API requests, parameter values may contain special characters. Encoding ensures proper processing on the server.
When you enter a query in a search engine, it gets encoded in the URL. For example, the query "hello world" becomes the parameter q=hello+world.
Form data submitted via GET is automatically encoded in the URL. Understanding this process helps with debugging.
Marketers add UTM parameters to URLs to track traffic sources. Values with spaces and special characters need to be encoded.
The URL in the redirect_uri parameter must be encoded so it does not break the structure of the main URL.
Domains with Cyrillic characters are converted to Punycode, while paths and parameters are encoded via Percent-Encoding.
See also: Base64 Encoding, HTML Encoding, Unicode Lookup