Free · desktop app · extension · add-ons · LMS
Your keyboard, witnessed.
The Authmarks desktop app records the one thing no document tool can see: your physical keystrokes. Free to download, free to use — sign in with your Authmarks account and your writing earns a record that can defend itself.
Why a desktop app
Editors can show what changed. Only the operating system can witness who typed it. The app builds a hash-chained receipt of every real keypress — and flags injected, synthetic input for what it is.
Mode 1
Witness
Runs beside whatever you write in — Google Docs in its own window, Word, anything. It witnesses your physical keystrokes at the operating-system level and builds a tamper-evident receipt chain of the typing itself.
Mode 2
Editor
Authmarks' own writing room. Every keystroke on the page is matched to the physical key that produced it within 80 milliseconds — the strongest single-machine record we make.
Always
Your call
Nothing records until you sign in, tick consent, and press Start. Pause or stop any time. Password fields end recording outright — they are never captured.
Every place Authmarks runs
Pick your surface
Desktop app
Available nowWindows · free
Witnesses your physical keystrokes at the operating-system level while you write in Google Docs, Word, or the Authmarks editor. The strongest record we make.
Download for WindowsChrome extension
Available nowGoogle Docs · Word for the web
Records how your document was written inside the browser and seals a verifiable C2PA record. Works wherever Chrome does, including Edge.
Add to ChromeLMS integration
Available nowCanvas · Blackboard · Brightspace · Schoology · Moodle
One standard LTI 1.3 registration puts Authmarks inside your school's LMS. Sealed records arrive through the gradebook.
Set up your LMSGoogle Docs add-on
Under reviewGoogle Workspace Marketplace
A native add-on in the Docs sidebar. Submitted to the Google Workspace Marketplace and awaiting Google's review — the link appears here the day it is approved.
Awaiting marketplace reviewMicrosoft Word add-in
In preparationWord on the desktop
A task-pane add-in for desktop Word. Built and working; the AppSource listing is in preparation. Pilot schools can run it today — write to us.
Coming soonVerify a record
Always availableNo install needed
Anyone — an instructor, a reviewer, a court — can check a sealed Authmarks record in the browser. Nothing to download.
Open the verifierDesktop builds
The native app, per platform
Windows
Windows 10 or 11, 64-bit. Portable app — unzip and run, nothing to install.
Windows may show a SmartScreen notice while our code-signing certificate is pending — choose “More info → Run anyway”. The app is published only through this page.
Linux
Debian/Ubuntu and Fedora/openSUSE packages, x86-64.
The Linux build is being prepared for release. It is not available yet — no fake buttons here.
macOS
Apple Silicon and Intel.
The macOS build is being prepared for release. It is not available yet — no fake buttons here.
The honest print
- Free to download and use. There is no licence fee for the desktop app; recording requires a free Authmarks sign-in so the record belongs to you.
- Not open source — the app is free to use, not free to copy. Provisional patent protection applies.
- Recording is opt-in per session, visible at all times in the tray, and never touches password fields.
- Downloads are published only on this page. Anything else is not ours.