Generate Secure HMAC Signatures Online
Initializing tool...
More Utilities
Related Tools
Ubify Intelligence Team
EDITORIAL TEAM
About This Tool
The HMAC Generator computes hash-based message authentication codes (HMACs) using SHA-1, SHA-256, or SHA-512 — combining your message with a secret key to produce a verifiable signature. Essential for verifying API webhooks and request authenticity. Free, no account, runs entirely in your browser.
How to Use
- 1
Enter your secret key in the key field.
- 2
Paste your message or payload into the message field.
- 3
Select the hash algorithm — SHA-256 is recommended for most API authentication use cases.
- 4
Copy the resulting HMAC signature and include it in your API request header.
Frequently Asked Questions
What is HMAC used for?
HMAC is commonly used to verify the authenticity of API requests and webhooks — the sender computes an HMAC with a shared secret and the receiver verifies it.
Is HMAC-SHA256 secure?
Yes. HMAC-SHA256 is considered secure and is widely used in production APIs and authentication systems including JWT signatures and AWS Signature V4.
Is this HMAC generator free?
Yes. Completely free with no account required.
What is an HMAC used for?
HMAC is used to prove that a message came from a specific sender and hasn't been changed, using a shared secret key.