Question 1

Is HMAC free to use?

Accepted Answer

Yes, HMAC is completely free. No account, no signup, and no payment is ever required.

Question 2

Does HMAC send my data to a server?

Accepted Answer

No. HMAC runs entirely in your browser. Your data is never uploaded to any server — all processing happens locally on your device.

Question 3

Is HMAC safe to use with sensitive data?

Accepted Answer

Yes. HMAC never sends your data to any server — all processing happens locally in your browser. There are no third-party trackers on your input, and no server logs of your data.

Question 4

What can I use HMAC for?

Accepted Answer

Compute HMAC of a message with a secret key for API signing and message authentication. SHA-1/256/384/512. Common use cases include hmac, mac, authentication.

Question 5

Do I need to install anything to use HMAC?

Accepted Answer

No. HMAC is a web-based tool — open the page and start using it. No download, no browser extension, no signup, no account.

HMAC

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