HMAC Generator
Generate HMAC message authentication codes
Input
Enter message and secret key
Result
HMAC digest output
About HMAC
HMAC (Hash-based Message Authentication Code) is a mechanism for calculating a message authentication code using a cryptographic hash function in combination with a secret key. It can verify both data integrity and authentication.
Generate keyed-hash message authentication codes (HMAC) using industry-standard algorithms. Paste your message and secret key to produce a cryptographically secure HMAC hash. All processing uses the Web Crypto API in your browser — nothing is sent to any server.
Key Features
- ✓SHA-256, SHA-384, SHA-512 algorithm support
- ✓Web Crypto API — zero server processing
- ✓Hex-encoded output
- ✓Copy with one click
- ✓Instant real-time generation
How to HMAC Generator Online
- 1
Enter message
Paste the text you want to authenticate.
- 2
Enter secret key
Provide the shared secret key.
- 3
Select algorithm
Choose SHA-256, SHA-384, or SHA-512.
- 4
Copy HMAC
Click generate and copy the hex output.
Common Use Cases
- •API request signing (AWS Signature V4, Stripe webhooks)
- •Webhook payload verification
- •Message authentication in distributed systems
- •Token-based authentication schemes