Question 1

What is HMAC?

Accepted Answer

HMAC (Hash-based Message Authentication Code) is a cryptographic technique that combines a hash function with a secret key to verify data integrity and authenticity.

Question 2

Which algorithm should I use?

Accepted Answer

SHA-256 is the most commonly used. SHA-384 and SHA-512 offer higher security for sensitive applications. SHA-256 is recommended for most use cases.

Question 3

Is this secure?

Accepted Answer

Yes. HMAC generation happens entirely in your browser using the Web Crypto API. Your message and key are never sent to any server.

HMAC Generator — SHA-256, SHA-384, SHA-512

HMAC Output

❓ Frequently Asked Questions

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HMAC Generator — SHA-256, SHA-384, SHA-512

HMAC Output

❓ Frequently Asked Questions

🔗 More Tools