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1Introduction
HMAC Calculator generates an HMAC message authentication code from a secret key and a hash algorithm. Enter the message and key, choose MD5, SHA-1 or SHA-256, and get a hex or Base64 result quickly.
2How to Use
1
Enter Message
Paste or type the original text to compute.
2
Enter Secret Key
Enter the shared secret key used for HMAC.
3
Choose Algorithm
Select MD5, SHA-1, SHA-256 and the result shows automatically.
3FAQ
What is the difference between HMAC and a normal hash?
HMAC requires a secret key and prevents tampering; a plain hash such as SHA-256 has no key and anyone can compute it.
Is my data uploaded to a server?
No. All computation happens locally in your browser; the message and key never leave your device.
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