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The ZeroKeyUSB firmware repository includes a lightweight web application that runs locally in your browser. It connects to the device over WebUSB and pushes the current epoch so TOTP codes stay in sync.

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Requirements

  • Chromium-based browser (Chrome, Edge, Brave) with WebUSB enabled
  • ZeroKeyUSB unlocked and connected via USB-C
  • Local copy of the tools/web-time-sync directory served via npm run dev
No Internet access is necessary once the page is loaded.

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Launching the tool

Open the printed local URL (typically http://localhost:5173) in your browser. You should see the ZeroKeyUSB logo and a “Connect” button.

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Sending the time

  1. Click Connect and select your ZeroKeyUSB from the device list (ZeroKeyUSB CDC).
  2. The page displays the current Unix epoch and a countdown to the next 30-second boundary.
  3. Press Sync now when the device requests time (shows REQTIME).
  4. The tool sends SETTIME <epoch> automatically and confirms success with a toast notification.
If the device was already in sync, it responds with OK and no changes are made.

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Safety features

  • The tool only communicates with USB devices whose vendor/product IDs match ZeroKeyUSB.
  • All commands are visible in the on-screen console for auditability.
  • No data leaves the browser tab; telemetry and analytics are disabled.

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Troubleshooting

The web time sync tool offers a user-friendly way to keep your hardware authenticator aligned without installing heavyweight software.