What does JWT Decoder actually do?

The JWT decoder splits a compact token into header and payload and shows the JSON. It does not check the signature, so a modified payload still decodes. Expiry (exp) is displayed, not enforced. Verification needs the secret or public key in a different step.

Does this JWT decoder verify the signature?

It decodes and inspects header and payload. Signature verification needs your secret or public key and is not assumed from decoding alone.

Are my tokens uploaded?

No. JWTs are decoded in your browser and never sent to DevTooKit for processing.

Is the JWT decoder free?

Yes — free, no account, no watermark.

Can I use it offline?

Yes after installing the DevTooKit PWA.

JWT Decoder

Decode JWT header and payload, inspect claims and expiration — locally in your browser. Free online — runs locally, no upload.

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JWT Decoder