HMAC Generator — Free Online Tool

Generate HMAC-SHA256 signatures with a secret key. HMAC Generator is a free online tool from the ToolsRift Hash & Crypto Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.

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How to use HMAC Generator

  1. Open the HMAC Generator above — it loads instantly, no account needed.
  2. Enter or upload your input. Everything is processed locally on your device.
  3. Get your result immediately and copy or download it with one click.

Frequently asked questions

What is HMAC?

Hash-based Message Authentication Code — combines a cryptographic hash with a secret key to authenticate messages.

How is HMAC different from a hash?

HMAC requires a secret key. Without the key, you cannot reproduce the MAC, unlike a plain hash.

Where is HMAC used?

API authentication (AWS Signature, Stripe webhooks), JWT signing, and cookie signing.

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