JWT Decoder
Decode JSON Web Tokens (JWT) to inspect header, payload and expiry. Runs locally in your browser.
Signature is not verified — decoding only.
How to use JWT Decoder
- 1Paste a JWT.
- 2See the decoded header and payload.
- 3Check the expiry time.
Frequently asked questions
Does the tool verify signatures?
No — signature verification requires the secret. This tool only decodes the token so you can inspect the claims.
Is my token sent anywhere?
Never. Decoding happens entirely in your browser.
Is my data safe?
Everything runs directly in your browser. Nothing is uploaded to a server, so your data stays private on your device.
Does it work on mobile?
Yes. ToolFlexPro is fully responsive and works on any phone, tablet or desktop.
Do I need to install anything?
No installs. It runs instantly in any modern browser (Chrome, Safari, Firefox, Edge, Brave).