$devtoolkit.sh/tools/hmac-generator

HMAC Generator

Generate HMAC-SHA-256/384/512 message authentication codes using a secret key.

HMAC-SHA-256
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HMAC-SHA-384
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HMAC-SHA-512
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FAQ

What is HMAC and when should I use it?
HMAC (Hash-based Message Authentication Code) combines a cryptographic hash with a secret key. It is used to verify both data integrity and authenticity — confirming that a message has not been tampered with and that it came from someone who knows the shared key.
How is HMAC different from a plain hash?
A plain hash (like SHA-256) only verifies data integrity — anyone can compute it. HMAC additionally requires knowledge of a secret key, making it suitable for authentication. Without the key, an attacker cannot forge a valid HMAC.
Is my secret key safe?
Yes. All computation happens in your browser using the Web Crypto API. Neither the message nor the secret key is transmitted to any server.

Compute Hash-based Message Authentication Codes (HMAC) using the Web Crypto API. Combines a message with a secret key to produce a unique authentication tag — ideal for verifying both the integrity and the authenticity of data. Supports HMAC-SHA-256, HMAC-SHA-384, and HMAC-SHA-512. All computation is done entirely in the browser.

/tools/hmac-generatorv1.0.0