HMAC Generator
5 toolsGenerate an HMAC digest from a key and message.
Runs in your browser — your files and text stay on your device
Generate an HMAC digest from a secret key and a message, as used to sign API requests and webhooks. Choose the hash algorithm and compare the result with what your service expects. It runs in your browser using the Web Crypto API.
How to use this tool
- 1Enter a secret key and message.
- 2Pick an algorithm.
- 3The HMAC digest updates automatically; click to copy.
Frequently asked questions
What is HMAC used for?
Combining a secret key with a message to prove both integrity and authenticity — commonly used for API request signing and webhook verification.
Is my key sent anywhere?
No — computed locally via the Web Crypto API.