Security & Cryptography

HMAC Calculator

Generate Hash-based Message Authentication Codes (HMAC) in real-time. Choose your hashing algorithm, input your message and key, and get outputs locally.

Message (Data String) Secret Key Hash Algorithm

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Computed HMAC Hash

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100% Private & Client-Side

Your secret key & message never leaves your browser — not even for a millisecond.

Verified Private

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No Server Transmission All computation runs in your browser. Zero data sent to our servers.

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No Storage We store nothing. No databases, no logs, no cookies with your input.

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Works Offline Once loaded, this tool works even with no internet connection.

Open-source on GitHub — read and verify the exact code powering this tool. View Source Code →

HMAC Calculator

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