Keyboard Tester
Press any key to test functionality. Keys turn Green when working.
How to Use This Tool
- 1Start Typing: Press any key on your physical keyboard. The corresponding key on the screen will light up Green.
- 2Check Ghosting: Press multiple keys at once (e.g., W+A+S+D). If all light up simultaneously, your keyboard supports anti-ghosting.
- 3Test Modifiers: Don't forget to test left/right
Shift,Ctrl, andAltkeys separately. - 4Function Keys: If F1-F12 don't light up, try holding the
Fnkey on your laptop while pressing them.
Troubleshooting
- •Key not working? It could be dust or a failing switch. Try cleaning under the keycap with compressed air.
- •Double typing (Chattering): If one press types "aa", "tt", etc., the switch contacts may be oxidized.
- •Windows Key stuck? Many gaming keyboards have a "Win Lock". Try
Fn + Winto unlock it. - •Wrong Layout showing? We detect the physical "scancode". An AZERTY 'A' lighting up 'Q' is normal behavior.
In-Depth Keyboard Knowledge Base
Why is my keyboard not typing certain letters?
If specific keys aren't working, it’s usually due to dust accumulation under the switch or a broken circuit trace.
Solution: Try removing the keycap and cleaning the switch with compressed air. If using a mechanical keyboard, the switch might be dead and needs replacement (if hot-swappable) or soldering.
What is "Ghosting" and how do I test it?
Ghosting occurs when you press multiple keys simultaneously, but some don't register. This is common in cheaper membrane keyboards.
How to test: Hold down both Shift keys and type a sentence, or try pressing W + A + S + D at the same time using our tool above. If a key doesn't light up green while held, your keyboard has ghosting limitations.
My keyboard is typing double letters (Key Chattering)
Key chattering happens when a single press registers as two or more (e.g., "tthe" instead of "the"). This is frequent in mechanical keyboards due to switch oxidation.
Fix: Use a contact cleaner spray specifically designed for electronics. Or, adjust the "Repeat Rate" in your operating system settings temporarily.
N-Key Rollover (NKRO) Explained
NKRO ensures that every key you press registers, no matter how many keys are held down at once. Most mechanical keyboards support NKRO, while standard office keyboards usually support 6-Key Rollover (6KRO).