HMAC Generator Online (MD5 to SHA-512)
Runs 100% in your browser — your files never leave your device.
HMACs prove a message came from someone holding a shared secret — the backbone of webhook signatures and API authentication. Paste your text, enter the secret key, pick an algorithm from MD5 through SHA-512, and copy the signature. The secret never leaves your browser.
How it works
- 1
Enter text and secret
Paste the message to sign and the shared secret key.
- 2
Pick an algorithm
HMAC-MD5 through HMAC-SHA-512 are all supported.
- 3
Copy the signature
One click copies the hex signature for your API or webhook.
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