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You are responsible for key management and output validation.

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HMAC Calculator

Calculate HMAC signatures using SHA-256, SHA-1, or MD5 entirely in your browser. Zero-knowledge architecture, no key transmission.

Your inputs remain on your device.

Hash Algorithm

Key processed in your browser only.

Output Format

API Authentication

Use HMAC-SHA256 for API request signing. Include timestamp to prevent replay attacks.

How It Works
Your inputs remain on your device.