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.

Which algorithm should I use?

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.

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

Tools

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

Generate HMAC hashes with custom secret keys using Web Crypto API

Message

Secret Key

Algorithm

HMAC Output

Enter message and key to generate HMAC...

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

HMAC Output

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❓ Frequently Asked Questions

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

HMAC Output

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❓ Frequently Asked Questions

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