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HMAC Keyed-Hash Signature Generator

100% In-Browser Privacy

Generate SHA-256, SHA-512, SHA-384, and SHA-1 HMAC signatures.

More in Security & Network

HMAC Cryptographic Signature Parameters

Presets:
Secret Signing Key
Encoding:
Payload / Message to Sign
Algorithm:
Computed HMAC-SHA-256 Digest Signatures
Hexadecimal Digest

Awaiting inputs...

Base64 Digest

Awaiting inputs...

Backend HMAC Verification Snippet (Node.js)
// Node.js Verification Example
const crypto = require('crypto');

const secret = 'whsec_99382194812398123';
const payload = "{\"id\":\"evt_12345\",\"event\":\"checkout.session.completed\",\"status\":\"paid\"}";

const computedSignature = crypto
  .createHmac('sha256', secret)
  .update(payload)
  .digest('hex');

console.log('Signature:', computedSignature);
100% In-Browser Cryptography: Computed using the hardware-accelerated Web Cryptography API.
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100% Zero-Upload Privacy

All computation executes exclusively inside your device memory using Web APIs and WebAssembly. No data or files ever leave your browser.

Real-Time Native Execution

Zero network roundtrips. Operates offline without sending external API requests, delivering instantaneous sub-millisecond computation.

Developer-First Architecture

Engineered with RFC standards, cryptographic primitives (Web Crypto Subtle API), and production-grade formatting libraries.

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