HMAC-SHA512 Generator
Generate HMAC-SHA512 signatures with the highest security margin in the SHA-2 family. Nothing ever leaves your browser.
Enter a message and secret key to generate the HMAC signature
Your secret key and message never leave your browser. All computation uses the Web Crypto API.
HMAC SHA-512 FAQ
What is HMAC-SHA512?
HMAC-SHA512 uses the SHA-512 hash function with a secret key to produce a 512-bit (64-byte) message authentication code. It provides the highest security margin in the SHA-2 HMAC family.
Is HMAC-SHA512 faster than HMAC-SHA256?
On 64-bit processors, yes — SHA-512 uses native 64-bit arithmetic and can be faster than SHA-256. On 32-bit or embedded systems, SHA-256 is typically faster.
Where is HMAC-SHA512 commonly used?
HMAC-SHA512 is used in cryptocurrency key derivation (BIP-39), JWT HS512 signatures, IPsec, and high-security API authentication where maximum output length is desired.
Can I use this tool for webhook verification?
Yes. Paste the webhook payload as the message, enter your signing secret, and compare the output against the signature header. Enable JSON normalization if the provider sorts keys before signing.
Need to share API keys or webhook secrets?
Don't paste credentials into chat or email. Use CredenShare to deliver them with AES-256 encryption and automatic expiration.