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HMAC Generator (SHA-256)

Create Hash-based Message Authentication Codes securely using Web Crypto API.

Processed locally in your browser. Secrets never leave your device.
Enter message and key

About the HMAC Generator

The Zadein HMAC Generator computes a Hash-based Message Authentication Code for a given message and secret key. HMAC is used to verify the integrity and authenticity of messages in APIs and secure communications.

How to use

  1. 1Enter the message you want to authenticate.
  2. 2Enter the secret key.
  3. 3Select the hash algorithm (SHA-256, SHA-512, etc.) and copy the generated HMAC.

Common use cases

  • Generate an HMAC for signing API requests or webhook payloads.
  • Verify that a received message has not been tampered with.
  • Produce test HMAC values during API integration development.
  • Learn how HMAC works by experimenting with different inputs and keys.

Frequently asked questions

Which hash algorithms are supported?

SHA-256 and SHA-512 are commonly supported. Additional algorithms may be available depending on the tool configuration.

Is my secret key safe to enter here?

For testing with non-production keys, the tool is safe as processing happens in the browser. Do not enter real production secret keys into web tools.

What is the difference between HMAC and a regular hash?

A regular hash is one-way and does not use a key. HMAC uses a secret key, which means only someone with the key can produce or verify the correct code.