HMAC Generator — Hash-Based Message Authentication
Generate HMAC signatures using SHA-256, SHA-384, or SHA-512 with a secret key. Verify message integrity and authenticity.
- HMAC provides message integrity and authenticity using a shared secret key
- SHA-256 is recommended for most use cases; SHA-512 for higher security
- Generated entirely in your browser — the secret never leaves your device
Frequently Asked Questions about HMAC Generator
- Is HMAC Generator completely free to use?
- Yes, HMAC Generator is 100% free with no sign-up, no watermarks, and no usage limits.
- Is my data private?
- HMAC Generator runs entirely in your browser — no data is ever sent to our servers. Your content stays on your device.
- Does it work offline?
- Once the page has loaded, HMAC Generator works fully offline in your browser — no internet connection is required.
- Is my sensitive data processed locally?
- Yes, all cryptographic operations run in your browser using the Web Crypto API. Your keys and secrets never leave your device.
- Does HMAC Generator work on mobile and tablet?
- Yes, HMAC Generator is fully responsive and works in all modern browsers on desktop, tablet, and mobile.
This tool runs entirely in your browser. No data is ever sent to our servers.