HMAC (Keyed-Hash Message Authentication Code) combines a cryptographic hash function with a secret secret key to verify data integrity and authenticity simultaneously.

Which hash functions are supported?

HMAC-SHA-256, HMAC-SHA-512, HMAC-SHA-384, and HMAC-SHA-1.

Are my secret keys sent over the internet?

No. Key derivation and HMAC signature generation use the browser's native window.crypto.subtle engine, ensuring zero data leaves your local machine.

HMAC (Keyed-Hash Message Authentication Code) combines a cryptographic hash function with a secret secret key to verify data integrity and authenticity simultaneously.

Which hash functions are supported?

HMAC-SHA-256, HMAC-SHA-512, HMAC-SHA-384, and HMAC-SHA-1.

Are my secret keys sent over the internet?

No. Key derivation and HMAC signature generation use the browser's native window.crypto.subtle engine, ensuring zero data leaves your local machine.

Free Client-Side HMAC Keyed-Hash Generator

DeveloperOffline Ready · Zero Uploads

Compute cryptographic Keyed-Hash Message Authentication Codes (HMAC) for webhook verification, API security, and message signing using native Web Crypto hardware APIs.

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