How to use the Keyboard Test
- Press keys one by one — each key lights up while held and stays marked once tested.
- Hold several keys together to see how many register at once (key rollover).
- Keys that never light up may be dead, remapped, or not supported by the browser.
Finding dead and stuck keys
Work across the keyboard row by row. A key that never lights up is not reaching the computer: it may be damaged, dirty, or remapped by software. A key that stays highlighted after you let go is stuck, or the keyboard is sending a repeated signal.
The panel shows the browser’s key and code values for the last key pressed, which also helps when a key produces the wrong character (usually a keyboard layout setting).
Key rollover and ghosting
Rollover is how many keys can be pressed at the same time and still register. Cheap keyboards often manage 2–3 keys in some combinations; gaming keyboards advertise 6-key or N-key rollover (NKRO). Hold down several keys and watch the "held now" counter. If a key you are holding does not light up, you have hit the keyboard’s limit — or it is ghosting.
Frequently asked questions
Why don’t some keys register?
The operating system reserves a few keys — like the Windows key, Print Screen or Fn — and never passes them to the browser. That does not mean the key is broken.
Does the keyboard test work with laptop keyboards?
Yes. Laptops lack some keys (numpad, Insert), so those simply stay unlit.
Is anything I type recorded?
No. Key presses are only used to light up the on-screen keyboard and are never stored or sent anywhere.