Tools
HMAC Signature Generator
Generate HMAC (Hash-based Message Authentication Code) signatures. Essential for payment gateway integration, API authentication, and webhook signature verification.
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Enter a secret key and message to generate HMAC signatures
Try clicking one of the preset examples above
HMAC is used for API authentication, payment gateway signature verification, and webhook security. All processing happens client-side.
How to use this tool
Generate keyed HMAC signatures while troubleshooting API authentication and webhook verification.
Suggested workflow
- Enter the exact message bytes and secret used by the integration.
- Choose the algorithm required by the provider.
- Compare the output with the provider's expected signature.
Good to know
Never paste a live production secret into a shared screen or an untrusted environment.
HMAC Signature Generator - CodeTools Toolbox - 47 free online developer tools.