HMAC Generator

Compute keyed HMAC signatures (SHA-1, SHA-256, SHA-384, SHA-512).

SHA-1 SHA-256 SHA-384 SHA-512

Key Output

Message

HMAC (hex)

HMAC-SHA-256 → 32-byte / 256-bit tag. The standard choice for API request signing (AWS SigV4, JWT HS256).

About this tool

Compute an HMAC (keyed hash) of a message using SHA-1, SHA-256, SHA-384 or SHA-512. Returns lowercase hex. Useful for signing webhook payloads and API requests.