HMAC Signature Generator

Generate Hash-based Message Authentication Codes (HMAC) using SHA-256, SHA-1, SHA-384, or SHA-512 with a secret key.

How It Works & Processing Standards

Generate Hash-based Message Authentication Codes (HMAC) using SHA-256, SHA-1, SHA-384, or SHA-512 with a secret key.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 2,000,000 characters

HMAC Signature Generator is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use HMAC Signature Generator

  1. 1
    Enter Message & KeyInput the payload text and your private secret key.
  2. 2
    Select AlgorithmPick SHA-256, SHA-512, SHA-384, or SHA-1 and choose hex or base64 format.
  3. 3
    Copy SignatureCopy the computed HMAC authentication code.

Common Use Cases

  • Testing API webhook signatures, AWS signature v4 validation, and JWT cryptographic debugging
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