JWT Decoder
Decode a JWT's header and payload locally, without sending your token anywhere.
Ad space — always below the tool, never inside it
How to use jwt decoder
1Paste your JWTPaste the full token, including all three dot-separated parts.
2Read the header and payloadBoth decode instantly into formatted JSON.
3Check the claimsLook at fields like exp, iat and sub to verify the token's contents.
Questions people ask
No — this only decodes the header and payload, which are just Base64-encoded JSON. It doesn't check whether the signature is valid.
No — decoding happens entirely in your browser. Never paste a production token into a tool you don't trust for anything beyond quick debugging.