Connected — privacy mode available
You don't need the internet. Disconnect and watch the tool work.
Online
🔒 Verify the privacy claim yourself
The simplest way to confirm your files never leave this device:
Disconnect from the internet.
Turn off your Wi-Fi → the tool keeps working. The banner up top turns green.
Why this works: the tool is JavaScript + WebAssembly that runs entirely in your browser. There is no upload step. Open DevTools → Network and watch — no file ever leaves.
🔒 Verify it yourself: after this page loads, turn off your Wi-Fi and sign anyway — your files are never sent over the network. When exactly can I disconnect?
or drop them here
Sign any file — PDF, Word, Excel, image, code, archive, or many at once PDFs let you place a visible signature on the page. Everything else is signed cryptographically without modification. Every signing produces a tamper-evident audit log.Sign as
Adds an extra trust signal to the audit log. Not required.
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