HMAC Generator
Compute keyed HMAC-SHA256 or HMAC-SHA512 signatures.
Runs locally · Nothing uploaded
Message
HMAC digest
Result will appear here…Advertisement
About HMAC Generator
Generates an HMAC of your message using a secret key and SHA-256 or SHA-512, via the Web Crypto API. This is the signature scheme behind webhook verification (Stripe, GitHub), API request signing, and JWTs with HS256. Both the message and key stay in your browser — nothing is transmitted.
Related tools
Security & CryptoRuns locally in your browser.SHA-256 GeneratorCompute the SHA-256 hash of any text using Web Crypto.EncodingRuns locally in your browser.JWT DecoderDecode a JWT's header and payload and check its expiry — locally.Security & CryptoRuns locally in your browser.SRI Hash GeneratorGenerate Subresource Integrity hashes for script and style tags.