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HMAC Generator

Generate keyed-hash message authentication codes (HMAC) with SHA-1/256/384/512.

Presets

Message

Interpreted as raw UTF-8 bytes. An empty message is valid and produces a defined HMAC.

Sign the exact bytes of any file — fully in your browser (up to 100 MB).

Produces a 256-bit (32-byte) tag.
Interpreted as raw UTF-8 bytes.
Enter a secret key to compute the HMAC.

HMAC output

HMAC-SHA256
Enter a secret key above to compute the HMAC of your message.