HMAC Generator
Generate HMAC signatures using SHA-256, SHA-384, or SHA-512 — entirely in your browser.
Secret Key
Message Payload
Generated HMAC Signature
Cryptographic Guarantee
This generator utilizes the native browser Web Crypto API (crypto.subtle) to compute secure HMAC signatures locally with zero server transmission.
Why Use Our HMAC Generator?
Compute secure cryptographic signatures instantly using browser hardware acceleration.
Message authentication codes (HMAC) are crucial for verifying both the data integrity and the authenticity of a message transmitted between systems, commonly used in webhooks, API request signing, and token authorization.
Our tool leverages standard Web Crypto interfaces to perform secure signing operations instantly. Because everything executes entirely within your browser environment, your private keys and payloads remain totally secure.
Multiple Hash Standards
Support for industry-standard SHA-256, SHA-384, and SHA-512 cryptographic hashing functions.
Zero Server Transmission
Your secret keys and confidential messages stay completely private inside your browser memory.
Instant Computation
Signatures update instantly as you modify your input keys or message text.
Hex & Base64 Formats
Switch seamlessly between Hexadecimal and Base64 output encodings to match your API requirements.
Webhook & API Testing
Easily generate signatures for validating webhook endpoints like Stripe, GitHub, or custom servers.
Completely Free & Unlocked
Perform unlimited signature generations with no sign-ups, accounts, or restrictions.