Tool4SaaS

HMAC Generator

Generate HMAC-SHA256, SHA384, and SHA512 authentication codes from messages and secret keys with hex and Base64 outputs for APIs and webhooks securely offline.

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About the author

Written and maintained by the Tool4SaaS team. Every tool runs locally in your browser and is tested in-house for accuracy. Last updated: .

Frequently asked questions

Keyed-hash message authentication via WebCrypto importKey and sign.

Yes, computation uses crypto.subtle locally.

Yes, it is free, works offline in your browser, and your data never leaves your device.

How to use HMAC Generator

  1. Enter message: Type message and secret key.
  2. Choose algo: Pick SHA-256, 384 or 512.
  3. Generate: Copy hex HMAC output.