./jwt-decoder
Free JWT Decoder Online
Paste a JSON Web Token (JWT) to instantly decode its header and payload. This tool does not verify signatures — it only decodes the base64url-encoded segments for inspection.
How to Use
- 01Paste your JWT token into the input field.
- 02The header and payload are decoded automatically as you type.
- 03Review the claims; timestamp fields like iat and exp are shown in human-readable format.
FAQ
Is my token sent anywhere?▼
No. Decoding happens 100% in your browser. Your token is never transmitted.
Does this verify the JWT signature?▼
No. This tool only decodes the token for inspection. Signature verification requires the secret or public key and should be done in your application code.
What do iat, exp, and nbf mean?▼
iat = issued-at time, exp = expiration time, nbf = not-before time. All three are Unix timestamps in seconds.