HMAC Generator
Generate HMAC signatures with SHA-256/512.
About HMAC Generator
HMAC Generator is a free online tool that lets you generate hmac signatures with sha-256/512 in seconds — no signup, no software to install, and no watermarks. Everything runs entirely in your browser, so your files and data never leave your device and nothing is uploaded to a server. Whether you need to hmac generator once or every day, this Security tool works instantly on desktop and mobile and is completely free to use. It's a fast, free alternative for anyone searching for a hmac sha256.
How to use this tool
- 1Enter your message and secret key.
- 2Choose the hash algorithm.
- 3Copy the HMAC signature.
Frequently asked questions
What is HMAC used for?
HMAC verifies both the integrity and authenticity of a message using a shared secret key, common in API request signing and webhooks.
Is my secret key sent anywhere?
No. The HMAC is computed locally with the Web Crypto API; your key and message never leave the browser.