JWT Decoder
Decode and inspect JWT header and payload locally in your browser — without verifying the signature.
What does this tool do?
A JSON Web Token (JWT) is three base64url-encoded parts — header, payload and signature — separated by dots. This tool decodes the header and payload so you can inspect the claims, algorithm and expiry timestamps.
⚠️ Important
Decoding a JWT does not verify its signature. This tool tells you what is inside a token, but it does not prove the token is authentic or was issued by who it claims to be. Never trust a token’s claims just because they decode successfully. Everything here runs locally in your browser.