Create Hash-based Message Authentication Codes for data integrity and authenticity
Want to embed this HMAC generator on your website? Use this code:
Secure your REST API endpoints with HMAC signatures to verify request authenticity.
Use Case: Preventing API abuse and ensuring requests come from authorized clients.
Verify webhook payloads from services like GitHub, Stripe, or PayPal.
Use Case: Ensuring webhook payloads haven't been tampered with during transmission.
Create tamper-proof session identifiers for web applications.
Use Case: Preventing session hijacking and privilege escalation attacks.
Verify that downloaded files haven't been corrupted or modified.
Use Case: Software distribution and data integrity validation.
Secure payment gateway communications and transaction validation.
Use Case: Preventing payment tampering and ensuring transaction authenticity.
Create secure, time-limited URLs for file access or API endpoints.
Use Case: Temporary file access and secure link sharing.
Learn the basics of Hash-based Message Authentication Codes, how they work, and why they're essential for modern security.
Read Tutorial →Step-by-step guide to implementing HMAC authentication in REST APIs using various programming languages.
Read Tutorial →Secure your webhook endpoints using HMAC signatures. Includes examples for GitHub, Stripe, and PayPal webhooks.
Read Tutorial →Compare different authentication methods and learn when to use HMAC, JWT tokens, or OAuth for your specific use case.
Read Tutorial →Learn about the most common pitfalls when implementing HMAC and how to avoid them in your applications.
Read Tutorial →Best practices for testing your HMAC implementation, including test vectors and validation techniques.
Read Tutorial →Compare our free HMAC generator with other popular tools and services:
| Feature | Our Tool | Online Tool A | Paid Service B | Command Line |
|---|---|---|---|---|
| Free to Use | ✅ | ✅ | ❌ | ✅ |
| Multiple Algorithms | ✅ (SHA-1, SHA-256, SHA-384, SHA-512) | ✅ (Limited) | ✅ | ✅ |
| Secure Key Generation | ✅ | ❌ | ✅ | ❌ |
| Download Results | ✅ | ❌ | ✅ | ✅ |
| Embed Code | ✅ | ❌ | ❌ | ❌ |
| API Access | ❌ (Client-side only) | ❌ | ✅ ($) | ✅ |
| Mobile Friendly | ✅ | ✅ | ✅ | ❌ |
| Educational Content | ✅ | ❌ | ❌ | ❌ |
| Privacy (Client-side) | ✅ | ❌ | ❌ | ✅ |
All computations happen in your browser. Your data never leaves your device, ensuring maximum privacy and security.
Built with modern web standards and optimized for performance. Works instantly without server delays.
Fully responsive design that works perfectly on all devices - desktop, tablet, and mobile.
Not just a tool - includes comprehensive guides, examples, and best practices to help you learn.
HMAC (Hash-based Message Authentication Code) is a specific type of message authentication code (MAC) involving a cryptographic hash function and a secret cryptographic key. It provides both data integrity and authenticity of a message.
HMAC provides strong security guarantees when used with modern hash algorithms like SHA-256 or SHA-512.
Any modification to the message or key will produce a completely different HMAC value.
HMAC verification is computationally efficient, making it suitable for high-performance systems.
Requires a secret key, preventing attackers from generating valid HMACs without the key.
The HMAC process combines the message and secret key through multiple iterations of hashing:
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