Is My Input Uploaded?

No. Processing runs locally in this browser tab. These tools do not upload or persist your input.

Can I Save The Result?

Use Copy or Download after processing. Supported text reports also offer a PDF export. Keep original files until you have checked the result.

JWT Generator & Signature Verifier

Sign HS256 JWTs and verify their signatures locally with explicit algorithm and time-claim checks.

Input & Settings

OperationJSON payloadHMAC secret (UTF-8)

Result

For development and debugging. A JWT is signed, not encrypted: anyone with the token can read its payload. Use test secrets here; production authentication must validate expiry, issuer, audience and permissions on the server.

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What Is the JWT Generator & Signature Verifier?

Sign HS256 JWTs and verify their signatures locally with explicit algorithm and time-claim checks.

How It Works

Enter a JSON payload and a random shared secret of at least 32 bytes. Sign the token, or switch to verification and paste an existing HS256 token.

When to Use It

Debugging test authentication flows. Tokens are signed, not encrypted; application servers must still enforce issuer, audience, expiry and authorization.

Frequently Asked Questions

Is My Input Uploaded?: No. Processing runs locally in this browser tab. These tools do not upload or persist your input.
Can I Save The Result?: Use Copy or Download after processing. Supported text reports also offer a PDF export. Keep original files until you have checked the result.

Found an issue? Send Feedback. See our data sources and update policy for tools that depend on changing information.