JWT Decoder, Verifier & Signer

Decode, verify signatures and sign JSON Web Tokens offline. Supports HS, RS, PS and ES algorithms plus JWKS. Your tokens and secrets never leave the browser.

Encoded Token

Paste your JWT token here...

Awaiting token...

Why use JWT Studio?

Secure & Local

Your secrets and tokens remain on your device, ensuring complete confidentiality.

Full Feature Set

Decode, sign, and verify using both symmetric secrets and asymmetric keys.

Developer Friendly

Live editing, claim explanations, and quick timestamp modifiers.

Frequently Asked Questions

Are my JWT tokens logged or stored?

Never. All decoding, verification, and signing happen directly in your browser. We don't have a backend to store them.

Can I verify a token using a public key?

Yes! We support asymmetric algorithms (RS, PS, ES) and allow you to verify using standard PEM public keys or a JWKS endpoint.

What algorithms are supported?

We support HS256/384/512, RS256/384/512, PS256/384/512, and ES256/384/512 for comprehensive coverage.

Thousands of developers, countless bugs fixed,
one simple tool.

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