Generate and verify HMAC

  1. Input
  2. Options
  3. Result
Your inputs

Hash algorithm

Calculations run on your device. Inputs are not saved automatically.

Use test secrets, not production credentials. The tool does not submit the message or key and does not include them in exports. HMAC authenticates data; it does not encrypt it or safely store passwords. Web Crypto requires HTTPS or a trusted local origin.

Generate and verify HMAC

Calculate an HMAC authentication code using SHA-256, SHA-384, SHA-512 or legacy SHA-1. Enter text or encoded bytes and compare an existing HMAC in your browser.

Quick start

Generate and verify HMAC

  1. Enter your data or try the example.
  2. Check the settings and create the report.
  3. Review the result and download a copy.
✓ The tool runs directly in the browser and is ready for quick checks without installing software.
✓ Input can be cleared and recalculated immediately, which is useful for repeated small tasks.
✓ Use fullscreen mode when you need more space for long text, structured data or large result blocks.
✓ Copy buttons are available on generated output so results can be reused in code, documents or support chats.
✓ Most operations are deterministic: the same input and options produce the same output.
✓ For sensitive content, prefer local browser tools and review the result before sharing it further.

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