Windows Keyboard Tester

A Windows keyboard tester is a diagnostic tool that visually displays a standard US ANSI keyboard layout and highlights keys as you press them on your physical keyboard. Our Windows keyboard tester maps every key press to its corresponding position on the visual layout, showing you in real time which keys are working, which modifier keys are active (Shift, Ctrl, Alt, Win), and providing detailed information about each key event including the key code, key value, and physical location. All processing runs entirely in your browser with no data ever sent to any server - your keystrokes stay completely private.

1. Press a Key: When you press any key on your physical keyboard, the browser fires a keydown event. The Windows keyboard tester captures this event and immediately highlights the corresponding key on the visual layout. The status bar updates with the key name, key code (like KeyA, ShiftLeft, Digit1), and physical location (left, right, or standard).
2. Modifier Tracking: Modifier keys (Shift, Ctrl, Alt, Win) are tracked separately with dedicated indicators in the status bar. The Windows keyboard tester shows which modifier keys are currently held down, making it easy to test keyboard shortcuts and identify sticky modifier keys. Caps Lock state is also tracked and shown on the Caps Lock key itself.
3. Event History: Every key press is logged in the event history table with timestamp, key name, key code, and location. The history keeps the last 50 events and shows the most recent 20 in the table, giving you a detailed record of your testing session for troubleshooting and analysis.

• Visual Keyboard Layout: A complete US ANSI Windows keyboard layout with all standard keys including function keys (F1-F12), number row, QWERTY letter block, bottom row modifiers, navigation cluster (Insert, Home, Page Up, Delete, End, Page Down), and arrow keys.
• Key Press Highlighting: Pressed keys are highlighted in the primary colour with a scale-down animation, giving clear visual feedback. Multiple simultaneous presses are tracked, so you can test N-key rollover and ghosting.
• Modifier States: Separate indicators for Shift (left/right), Ctrl (left/right), Alt (left/right), Win (left/right), and Caps Lock - each shown with an active/inactive badge in the modifier status bar.
• Key Event Details: The status bar shows the last pressed key name, key code, physical location, and total number of keys tested during the session.

Start by pressing every key on your keyboard in a systematic order - go row by row from top to bottom, left to right. This ensures no key is missed. Pay special attention to modifier keys (Shift, Ctrl, Alt, Win) as they are used most frequently in shortcuts and can develop issues without obvious symptoms. Test key combinations by holding a modifier and pressing multiple letter keys - the Windows keyboard tester shows all pressed keys simultaneously, which helps identify ghosting or rollover limits. If a key lights up but the wrong key code appears, this could indicate a keyboard layout mismatch (e.g., a UK keyboard with US layout configured). For laptop keyboards, pay extra attention to the function key row - some laptops require holding an Fn key to access F1-F12. Run the keyboard tester test after cleaning, after liquid spills (wait for complete drying), and periodically to catch developing issues before they become critical.