Keyboard Lock OSD is a lightweight Windows utility that shows a compact on-screen indicator for Caps Lock, Num Lock, and Scroll Lock changes. It stays in the system tray, reacts immediately to lock-key input, and keeps the current state visible across single-monitor and multi-monitor setups without interrupting your typing flow.
Download the latest Windows release. Open the latest release and download the Windows .exe installer.
- Instant feedback for Caps Lock, Num Lock, and Scroll Lock state changes.
- Compact bottom-center OSD overlay designed to stay out of the way.
- Multi-monitor friendly: each connected display gets its own bottom-center OSD, with display changes synced automatically.
- Per-key controls for choosing which lock keys should show an overlay.
- Settings window with current key states and built-in overlay preview.
- Tray-first startup with optional start at login.
- Optional fullscreen suppression for games, presentations, and video playback.
- English and Chinese UI, selected automatically from the system language.
- Signed auto-updates through GitHub Releases in release builds.
- Launch the app. It starts minimized to the system tray.
- Press Caps Lock, Num Lock, or Scroll Lock to see the state overlay.
- Click the tray icon to open settings.
- Adjust start at login, fullscreen suppression, and per-key overlay visibility.
- Laptop users whose keyboards do not have visible lock-key indicators.
- External keyboard users who often miss Caps Lock or Num Lock changes.
- Multi-monitor desktop users who want the state hint visible on every active screen.
- Windows users who want clear lock-key feedback without interrupting input.
pnpm install
pnpm tauri devpnpm run build
cargo check --manifest-path src-tauri/Cargo.toml