HMAC Generator

Generate Hash-based Message Authentication Codes using a secret key and your chosen algorithm.

Message

Secret Key

Algorithm

Key Encoding

Output Encoding

HMAC Output

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Bit Length

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HMAC Reference

Algorithm	Output Size	Security
HMAC-MD5	128 bits / 32 hex	Weak (legacy only)
HMAC-SHA-1	160 bits / 40 hex	Weak (avoid)
HMAC-SHA-224	224 bits / 56 hex	Good
HMAC-SHA-256	256 bits / 64 hex	Recommended
HMAC-SHA-384	384 bits / 96 hex	Strong
HMAC-SHA-512	512 bits / 128 hex	Very Strong