JWT Decoder
Decode and inspect JWT header and payload claims.
Runs entirely in your browser. Your data is never uploaded.
About JWT Decoder
JWT Decoder splits a JSON Web Token into its header and payload and decodes the Base64URL sections so you can inspect claims like exp, iat and sub. Decoding only — nothing is sent anywhere.
How to use
- 1Paste a JWT.
- 2Read the decoded header and payload.
- 3Check expiry and claims.
Frequently asked questions
Does it verify signatures?
No — it decodes for inspection only and never transmits the token.