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HMAC Generator

Compute keyed HMAC signatures (SHA-1/256/512).

How to use

  1. Enter the message and secret key.
  2. Pick the hash algorithm.
  3. Generate and copy the hex HMAC.

Frequently asked questions

What is HMAC for?

Verifying message integrity and authenticity with a shared secret - webhooks and API signatures use it heavily.

Is my key safe?

The computation is local - but use test keys online as a habit, never production secrets.

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