HMAC Generator & Verifier (SHA-256, SHA-512)

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About HMAC Generator & Verifier

Generate HMAC signatures for messages using a shared secret. This is useful for verifying webhook requests (Stripe, GitHub, etc.) or creating test signatures. Everything runs locally in your browser.

How to use

Paste your secret key and message.
Choose SHA-256 or SHA-512.
Copy the signature in hex, base64, or base64url.

Privacy

No data is uploaded or stored.

If you are working with signed tokens or API payloads, see also JWT Generator, JWT Decoder, and SHA256 Hash Generator.

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