HMAC generator
Compute HMAC using Web Crypto (SubtleCrypto). Your secret and message stay in the browser.
Try it with this example
Choose SHA-256, SHA-384, or SHA-512, enter secret and message, then copy hex or Base64 output.
What is this tool?
How do I compute HMAC-SHA for an API? Enter a secret and message to get HMAC digests (hex and Base64). Uses Web Crypto in your browser—nothing is uploaded.