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HMAC Calculator

Calculate HMAC-SHA-256 with your own key.

Input

Up to 200 KB

Result

Your result will appear here.

 Processed on your device · Content is not stored.


Instructions & limits
How to use
Calculate HMAC-SHA-256 with your own key.
  1. Enter your content, or select Use example.
  2. Adjust the available options.
  3. Select Run tool, review the result and copy or download it.
When to use this tool
Calculate HMAC-SHA-256 with your own key.
Example input
Omkey Tools
Limits
Only HMAC-SHA-256. The key is UTF-8 text, not hexadecimal or Base64. Keys are not stored. Input up to 200 KB.
Frequently asked questions
What does this tool do?
Calculate HMAC-SHA-256 with your own key.
What are the limits?
Only HMAC-SHA-256. The key is UTF-8 text, not hexadecimal or Base64. Keys are not stored. Input up to 200 KB.
Is my data sent to a server?
No. This tool runs in your browser. We do not receive your input or result.
Do I need an account?
No. Use the tools for free without signing in. Favorites and recent tools are stored only in your browser.
Does this work on mobile?
Yes, in a modern browser with Web Crypto support. 
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