HMAC Generator — free online tool
Sometimes you need to sign a message so the other side can check it really came from you and wasn't changed on the way. That usually means an HMAC, and writing a quick script just to get one signature is a hassle. We added a free tool that does it for you — HMAC Generator — right in your browser.
What it does
You paste a message and a secret key, pick a hash, and it gives you back the HMAC signature. You can choose SHA-256, SHA-1, SHA-384 or SHA-512, so it matches whatever the other system expects.
Nothing leaves your device
It all runs inside your browser. Your message and your secret key are never uploaded to a server, and nothing is saved anywhere. When you close the tab, it's gone.
How to use it
- Open HMAC Generator and type or paste your message.
- Enter your secret key and choose the hash you need (SHA-256, SHA-1, SHA-384 or SHA-512).
- Copy the signature it shows.
It's free with no limit. There are more small tools on the Apps page.