HMAC Generator
Generate an HMAC signature with a secret key.
HMAC-SHA-256
What Is HMAC?
HMAC (Hash-based Message Authentication Code) combines a secret key with a message and a hash function to produce a signature that proves both integrity and authenticity — only someone with the key can generate or verify it. It's used to sign webhooks, API requests, and JWTs. This tool uses your browser's native Web Crypto API; the key and message never leave your device.
Related Cryptography & Security tools
Password Generator
Generate strong, random passwords locally.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes locally.
JWT Decoder
Decode JSON Web Tokens instantly and offline.
Bcrypt Generator
Generate and verify Bcrypt hashes with custom salt rounds.
MD5 Hash Generator
Generate an MD5 hash from any text.
SHA-1 Hash Generator
Generate a SHA-1 hash from any text.
SHA-256 Hash Generator
Generate a SHA-256 hash from any text.
SHA-512 Hash Generator
Generate a SHA-512 hash from any text.