Generador HMAC
Generador HMAC gratuito. Crea firmas HMAC con SHA-1, 256, 384 o 512 y cualquier secreto. Salida Hex y Base64. Para firma de webhooks, autenticación de API.
Runs in your browserUpdated Apr 26, 2026
Input
Output
Hex
Base64
Preguntas frecuentes
›What is HMAC?
Hash-based Message Authentication Code — a way to verify a message hasn't been tampered with using a shared secret. Common in webhook signing.
›Is HMAC encryption?
No — HMAC is authentication. The message itself is in cleartext; HMAC just lets the receiver verify it came from someone with the same secret.
›Which algorithm should I use?
HMAC-SHA256 is the modern default. HMAC-SHA1 is still common in older systems but should be avoided for new work.
›Is my secret sent to a server?
No — generation runs entirely in your browser via the Web Crypto API.
›Is the generator free?
Yes — fully free, no signup.