JWT decoder
Decode a JWT’s header and payload without sending the token to a server.
This tool only decodes the content. It does not verify the signature or confirm that the token is authentic.
How it works
Paste a JWT token. The tool splits its segments and decodes the Base64URL header and payload. It does not verify the cryptographic signature.
Frequently asked questions
Does this tool check the JWT's signature?
No. It only decodes the header and the payload. A decoded token should not be considered valid or authentic for that reason.
Does the token leave my browser?
No. Decoding is done locally.