HMAC Generator
NewGenerate Hash-based Message Authentication Codes (HMAC) using any secret key and SHA-256, SHA-384, or SHA-512 algorithms. HMAC combines a cryptographic hash function with a secret key to verify both data integrity and authenticity. It is widely used in API authentication (like AWS Signature v4), JWT signing, webhook validation, and secure message transmission. Everything runs in your browser using the Web Crypto API.
HMAC Generator
Generate Hash-based Message Authentication Code (HMAC) using a secret key.
Enter message and secret key to generate HMAC
How to Use HMAC Generator
- 1Enter the message to authenticate
- 2Enter your secret key
- 3Select the hash algorithm (SHA-256/384/512)
- 4Copy the HMAC signature
Your Privacy is Protected
HMAC Generator runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
What is HMAC used for?
HMAC is used to verify message integrity and authenticity. It is used in API request signing, JWT tokens, webhook validation, and two-party communications.
Is HMAC the same as a regular hash?
No. A regular hash (like SHA-256) only verifies integrity — anyone can compute it. HMAC requires a secret key, so it also verifies the sender identity.
Why Use This Tool?
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