Transform addresses and parameters
The URL encoder and decoder handles percent-encoding in links and query strings. It helps build redirect URLs, read UTM parameters, and confirm what your API actually receives. Long queries and Unicode slugs are supported.
Raw string or address input
Paste a full URL or only the query segment—the tool shows the decoded text you intended.
Spaces and non-ASCII characters must be encoded or proxies may truncate the request.
String with percent-encoding
Encoded output is ready for href, fetch, and logs. Decode mode restores characters from sequences like %D0%.
Compare input and output when debugging double encoding—a frequent cause of 400 responses.