Paste a JWT to inspect header and payload. Signature is shown but never sent anywhere.
100% in your browser · no uploads · no ad trackers
About JWT Decoder
JWT Decoder splits a JSON Web Token into its header, payload, and signature so you can read claims like `exp`, `iat`, and `sub` at a glance. Use it to debug auth flows or check token expiry - and because it runs locally, even production tokens never leave your browser.
Token
Header
-
Payload
-
How to use
1.Paste a JWT.
2.Inspect decoded header & payload.
FAQ
Does it verify the signature?
No - verification requires the signing secret or public key, which you should never paste into a third-party tool. The signature is shown so you can copy it, not validated.
Are timestamps converted to readable dates?
Yes - standard claims like `exp`, `iat`, and `nbf` are shown both as Unix timestamps and human-readable dates.
Is JWT Decoder free?
Yes. Every tool on docsntools is 100% free with no signup, no watermarks, and no upload limits.
Are my files uploaded to a server?
No. All processing happens entirely in your browser. Your files never leave your device.
Does it work on mobile?
Yes - every tool is responsive and works in modern mobile browsers (Chrome, Safari, Firefox).