How to use the keyboard tester
- Click anywhere on the page, then press each key.
- A key turns blue while you hold it and green once it has been detected.
- A key that stays grey after you press it was not detected.
Common key problems
- Dead key: never lights up. Try pressing it near the edges too.
- Sticky key: stays blue after you let go, often because of dust or a spill.
- Wrong key: a different key lights up, usually because of a layout setting.
Rollover and ghosting
Rollover is how many keys a keyboard can report at once. Hold the keys you use together in games, such as W, A, Shift and Space, and watch Most at once. If a held key stops lighting up, or one you did not press appears, that combination ghosts.