URL Encoder & Decoder

URL encoding represents characters that have special meaning or are not safe in a URL using percent-encoded bytes. A space may become %20, while reserved characters such as ?, &, and = should be encoded when they are data inside a component but preserved when they delimit the URL structure. Encoding the whole URL when only one query value needed encoding is a common source of broken links.

Separate the URL into its components, then encode a path segment or query value with the API that matches that component. Preserve existing delimiters and avoid repeated encode/decode cycles that turn percent signs into data. Normalize and validate the destination origin before using a decoded value in a redirect or request. A correctly encoded string can still point to an untrusted host, so encoding never replaces allow-list validation.

Callback parameters and diagnostic links often contain identifiers that should remain in the developer's session. Local encoding is immediate and avoids creating a copy on a remote service. Use the output as a representation, not a security boundary: browsers, servers, proxies, and frameworks can normalize URLs differently. Test the final request with repeated parameters, Unicode characters, reserved delimiters, and an empty value.