SecurityRuns locally · No upload

HMAC Generator

Compute HMAC signatures with a secret key and message — same workbench as the Hash Generator. Used for API webhooks, JWT HS256, and request signing.

Private by design

Everything runs in your browser. Your input is never uploaded, stored, or logged on our servers.

Works offline after load

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Generate SHA-256, SHA-384, and SHA-512 hashes online with live output. HMAC tab for webhook signatures — free, private, Web Crypto API.

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Understand when to use a plain hash versus HMAC — and how Utiliio's Hash/HMAC workbench covers both.

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Frequently asked questions

Can I compute plain SHA-256 hashes here?+

Yes. Switch to the Hash tab in the same workbench for SHA-256, SHA-384, or SHA-512 without a secret key.

Is this tool free?+

Yes. Every Utiliio utility is free with no sign-up, usage limits, or paywalls.

Do you store my data?+

No. Processing happens entirely in your browser. Your input never leaves your device.

Can I use this tool offline?+

Yes. Once the page loads, most tools continue working without an internet connection.