DevScratchpad

HMAC Generator

Valid
0 chars0 bytes

Computed Digest

Hex Output
Waiting for input...
Base64 Output
Waiting for input...
Integration Tip (Node.js)
crypto.createHmac('sha256', secret).update(payload).digest('hex')

HMAC Generator & Signer (Offline & Secure)

Generate HMAC signatures online using SHA-256, SHA-512, MD5 with secret keys. Client-side webhook testing.

How to use

  1. Enter your payload string and secret key.
  2. Choose HMAC hashing algorithm (SHA256, SHA512, etc.).
  3. Copy the computed Hex or Base64 signature.

Important Considerations

  • Binary key formats vs UTF-8 string keys.

Privacy Notice: This tool is strictly client-side. All processing runs in your local browser memory using JavaScript. No text, tokens, payloads, or logs are ever transmitted to any remote server or analytics engine. You can even use this tool completely offline.

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