HMAC Generator (SHA-256/384/512)

Generate keyed-hash message authentication codes (HMAC).

Free · Runs in your browser · Last updated 2026-05-03

Secret key

Algorithm

Message Result (hex)

About this tool

Compute HMAC signatures using the Web Crypto API with SHA-256, SHA-384 or SHA-512 and any secret key. Returns hex output.

Privacy

All processing for HMAC Generator happens locally inside your browser using JavaScript. Your input is never uploaded to a server, logged, or shared with third parties.

Frequently asked questions

Is the HMAC Generator free to use?

Yes. HMAC Generator is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.

Is my data safe when I use HMAC Generator?

All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.

Does HMAC Generator work offline?

Once the page has loaded, the tool runs entirely client-side. You can disconnect from the internet and it will keep working in the same browser tab.

Which browsers are supported?

HMAC Generator works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.

Do I need to install anything?

No. HMAC Generator runs in any modern web browser with no installation, browser extension, or account required.

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