bhylu.com

HMAC calculator

Authenticate a message with a shared test secret.

Runs in your browser · No account
Choose your input and settings to begin.

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How to use it

  1. Choose an operation and enter test values.
  2. Run the tool, then copy or download the result.
  3. Clear the page when you finish with a secret.

Good to know

  • Processing happens in your browser. Inputs are not saved or sent to a tool endpoint.
  • Use HTTPS or localhost for browser cryptography. These helpers are not a security audit.
  • Basic Auth and JWT payloads are encodings, not encryption. Keep credentials out of shared screenshots.

Your original input stays available until you clear it or leave the page. Privacy details.