Utilumo
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HMAC Generator

Generate HMAC signatures locally with SHA-256, SHA-384, or SHA-512.

HMAC generator workspace

Generate HMAC signatures for text locally with Web Crypto.

HMAC settings

HMAC signs a message with a shared secret. Keep real secrets out of screenshots and shared browser sessions.

Message

Secret

HMAC output

Message and secret needed

Enter a message and secret to generate an HMAC.

Files are processed in your browser. No data is uploaded.

Questions

Does HMAC Generator upload my secret?

No. The message and secret are signed locally in your browser tab.

Which HMAC algorithms are supported?

It supports HMAC with SHA-256, SHA-384, and SHA-512 through the browser Web Crypto API.

Does Utilumo upload my input?

No. This tool is designed for local browser processing and does not send your input to a server.

Do I need an account?

No. Utilumo tools are built to work without accounts or sign-in.