HMAC Generator

HMAC (Hash-based Message Authentication Code) combines a cryptographic hash function with a secret key to create a unique fingerprint of your message. This tool leverages your browser's native Web Crypto API to perform all computations client-side, making it both fast and secure.

Simply enter your text message and secret key, select your preferred hashing algorithm (SHA-1, SHA-256, SHA-384, or SHA-512), and the tool instantly generates the corresponding HMAC. The algorithm mixes your key with the message through two rounds of hashing, producing a tamper-proof authentication code that proves message integrity and authenticity.

You can export the result in hexadecimal or base64 encoding, making it compatible with any API, webhook, or authentication system. The base64 format is particularly useful for JSON payloads and HTTP headers, while hex is standard for most cryptographic applications.

• API Authentication: Sign API requests with HMAC to verify that requests come from trusted clients and haven't been modified in transit
• Webhook Verification: Validate incoming webhooks from services like Stripe, GitHub, or Slack by comparing their HMAC signatures with your secret key
• Message Integrity: Ensure data hasn't been tampered with by verifying HMAC signatures of files, documents, or transmitted messages
• OAuth & Token Generation: Create secure authentication tokens and signatures for OAuth implementations and secure communication protocols
• Database Security: Verify data integrity in databases by storing HMAC values alongside sensitive records and checking them periodically