JWT Decoder
Decode a JSON Web Token (JWT) to see its header and payload claims, including expiry. Runs locally; the signature is not verified here. Free, fast and private.
Note: this decodes the token so you can read it. It does not verify the signature — that needs the secret key, which you should never paste into a website.
Your result will appear here.
How to use JWT Decoder
- Paste the full JWT (three parts separated by dots).
- Click Decode JWT to read the header and payload claims.
- Check the expiry claim to see if the token is still valid.
Note: this tool runs in your browser. Nothing is uploaded.
Frequently Asked Questions
Is this tool free?
Yes, it is 100% free with no sign-up. Your data stays in your browser.
Do I need to install anything?
No. It works in any modern browser on phone, tablet or computer.
Is my data uploaded?
No. This tool runs entirely in your browser and your input is never uploaded to a server.
Does this tool verify the JWT signature?
No. Verification needs the secret key, and you should never paste a secret into a website. This tool only decodes the readable header and payload.