HMAC Generator

HMAC-SHA signatures with a key

Message

Secret key

Algorithm

Output

HMAC signature

Enter a message and key…

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About the HMAC Generator

Generate HMAC signatures (HMAC-SHA1/256/384/512) from a message and secret key, output as hex or Base64. Computed live with the Web Crypto API — ideal for testing webhook signatures, API request signing, and token validation without exposing your secret to any server.

How to use

1Paste the message body.
2Enter the shared secret key.
3Pick the algorithm and encoding, then copy the signature.

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HMAC Generator is part of DevKit — 100 free, privacy-first tools for developers, students, and everyone, built by Minhazul Ashim. Everything runs in your browser; your data never leaves your machine.