URL Encoding: Handling Special Characters in Web Applications

The Anatomy of a URL Request

URLs are designed to contain only a specific set of characters. When you need to include symbols like ampersands or spaces, they must be converted into percent-encoding.

Common Encoding Conversions

Space: %20

Ampersand: %26

Slash: %2F

Question: %3F

Common Encoding Errors

A frequent mistake is failing to encode user-generated input. For example, if a user searches for 'Research & Development', the ampersand could be interpreted as a new query separator. Correctly encoding this ensures the server receives the full string.

In practice, this shows up most often in query strings and form submissions — an unencoded & in a value can be misread as the start of the next parameter, and an unencoded % or + can silently corrupt the character after it.

Use our URL Encoder to manually fix a broken link during development, or the URL Decoder to see exactly what an already-encoded URL contains — both help ensure cross-browser compatibility for your links.