Is this HMAC Generator safe for sensitive data & credentials?

Yes, 100%. All processing runs client-side in your local browser memory. No text, tokens, payloads, or logs are ever transmitted to any remote server or analytics engine.

Can I use HMAC Generator offline without internet?

Yes. Because this tool runs strictly on client-side JavaScript with zero external API calls, once the web application is loaded in your browser it will continue working offline.

How does URL state sharing work?

When you click Share Payload, your state is encoded directly into a URL hash fragment (#data=...) without storing anything on a database server.

HMAC Generator Online — SHA256, SHA512 Mac Authentication

HMAC Generator (Offline & Secure)

Generate HMAC signatures securely in your browser using a secret key and payload.

How to use

Enter your secret key.
Enter the message payload.
Select the hash algorithm and view the HMAC output.

100% Client-Side Privacy: This tool executes entirely within your browser's runtime environment. No payloads, tokens, or inputs are transmitted to external servers. Safe for offline usage.

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