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JWT decoder

JWT decoder

Read a JSON Web Token and check its signature with the secret or public key.

JWTHeaderPayloadSignature

Header, payload, signature

Processed on your device

The working-out happens inside your browser.

Nothing you type is sent
No sign-up
No daily limits

How to use it

Paste the token.
Read the header, payload and times.

Opening the tool…

Questions people ask

Is my data sent anywhere?

No. Everything runs in your browser on this device, so it is safe for private data, API responses and tokens.

Does this check that the token is genuine?

No. Checking needs the secret or public key, which only the issuing server should have. Treat decoded contents as unverified.

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© 2026 Virtual ToolKit. Calculators give estimates; check important figures with your bank or a professional.

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