Keyboard Tester

How to Use the Online Keyboard Tester

1. Press Keys: Simply start typing on your physical keyboard. The virtual keyboard above will light up.
2. Check Color Codes:
   • Amber: Key is currently pressed (Active).
   • Green: Key has been successfully registered and released (Working).
   • White/Gray: Key has not been pressed yet.
3. Verify Special Keys: Test Shift, Ctrl, Alt, and Function (F1-F12) keys individually to ensure they register correctly.
4. Identify Issues: If a key doesn't light up or requires multiple hard presses, you may have a faulty switch or dust debris.

What is Keyboard Ghosting?

Keyboard Ghosting occurs when you press multiple keys simultaneously, and one or more of them fail to register. This is common in cheaper keyboards during gaming or fast typing.

Our tool helps you detect ghosting by allowing you to hold down multiple keys at once. Watch the "Active" (Amber) keys to see how many your keyboard can handle simultaneously (known as N-Key Rollover).

Understanding JavaScript Key Events

For developers, we display real-time event data found in modern web browsers:

• event.key: The value of the key pressed (e.g., "a", "Enter"). Considers the Shift state (shows "A" instead of "a").
• event.code: The physical key location. For example, both left and right Shift keys return distinct codes (`ShiftLeft` vs `ShiftRight`).
• event.which: A legacy numeric code representing the key. Still used in older systems but deprecated in modern web standards.