Dev / HMAC
HMAC-SHA256 in the browser
Key and message stay in this tab.
Last checked: September 2026. Confirm millimetres, pixels, and KB on the official form. Not a government website.
Runs in this tab. 0 uploads. MD5 is a checksum, not security.
01
Drop
Drop the file. It stays in this browser tab.
02
Preset applied
Set the cap or preset for this job.
03
Download
Download from this device. Nothing is uploaded.
FAQ
Questions, answered
Key uploaded?Open
No.
Is anything uploaded?Open
No. This tool runs in your browser tab. Close it and the data is gone.
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