HMAC Generator

Keyed hashes: HMAC-SHA256 and more.

How HMAC works

HMAC mixes a secret key into a hash so that only someone who knows the key can produce (or check) the result. It proves a message is authentic and unmodified.

It is commonly used to sign webhooks and API requests. Compare HMACs with a constant-time comparison in real code.

Processed locally in your browser — your input is never uploaded.

What is HMAC Generator?

Keyed hashes: HMAC-SHA256 and more. HMAC mixes a secret key into a hash so that only someone who knows the key can produce (or check) the result. It proves a message is authentic and unmodified.

Is HMAC Generator free to use?

Yes. HMAC Generator on DevCipher is completely free, with no sign-up, no limits and no ads.

Is my data safe when I use HMAC Generator?

Yes. Everything runs locally in your browser. Your input is never uploaded to a server, and sensitive values such as keys and tokens are never saved.

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