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Online Multi Tools

HMAC

Compute HMAC for API signing and message authentication.

Examples

— click any card to load

Related tools

Frequently Asked Questions

Is HMAC free to use?
Yes, HMAC is completely free. No account, no signup, and no payment is ever required.
Does HMAC send my data to a server?
No. HMAC runs entirely in your browser. Your data is never uploaded to any server — all processing happens locally on your device.
Can I use HMAC offline?
Yes. Once the page has loaded, HMAC works without an internet connection. No network requests are made when you use the tool.