JWT Decoder

Decode a JSON Web Token header and payload in your browser. View-only — signature is not verified.

Paste a JWT

Three base64url parts separated by dots. Decoding runs locally with atob. Nothing is sent to a server.


      
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FAQ — JSON Web Tokens

      
Does this decoder verify the signature?

      
No. It only base64url-decodes header and payload. Do not treat a decoded token as authentic.

      
Is my token uploaded?

      
No. Parsing stays in JavaScript in this page.

      
Why a dedicated page?

      
Search engines index a focused URL better than a query-string hash on a multi-tool homepage.