About this test
The keyboard test reads the same key events your apps receive and marks every key you press on a full-size layout, including the function row, navigation block and numpad. It also counts how many keys register at once, so you can check rollover and ghosting on gaming keyboards, and logs the exact key code for troubleshooting layouts.
How to use this test
- Click anywhere on the page so it has keyboard focus.
- Press every key once. Tested keys turn green; a key that stays dark did not register.
- Hold several keys together to see the maximum rollover your keyboard supports.
Frequently asked questions
Why doesn't my Fn or Print Screen key light up?
Those keys are often handled by the keyboard firmware or the operating system and never reach the browser. They can still work in other apps.
What is N-key rollover?
It is how many keys can be held at the same time and still register. Office keyboards often stop at 2–6 keys; gaming keyboards usually support all keys.
Can this test fix a dead key?
No, it only shows the problem. Our keyboard fix guide covers cleaning, driver and layout fixes.