HMAC Generator

Generate Hash-based Message Authentication Codes (HMAC) using SHA-256, SHA-384, SHA-512. Used for API authentication, webhook verification, and message integrity.

Secret Key

Message

Output Encoding

Hexadecimal Base64

Generated HMACs:

HMAC-SHA256: -

HMAC-SHA384: -

HMAC-SHA512: -

HMAC Verification

Paste an expected HMAC to verify against the generated one.

Algorithm to Verify

Expected HMAC

Common HMAC Use Cases

Webhooks Verify webhook payloads from GitHub, Stripe, etc.

API Auth Sign API requests (AWS Signature V4, etc.)

Integrity Verify data hasn't been tampered with