Keyboard Tester
Press any key: it lights up on the keyboard below. Check that every key works, see its codes, and find out how many keys your keyboard registers at once.
Click here first if keys don't register, then start typing.
held tested
Last key
—
| event.key | — |
|---|---|
| event.code | — |
| keyCode | — |
| location | — |
| modifiers | — |
Progress & rollover
0of 104 keys tested
0keys held now
0most at once (rollover)
0key presses
Rollover test: press and hold as many keys as you can. If a key you're holding doesn't light up, your keyboard is ghosting / blocking on that combination. Many office keyboards stop at 2–6 keys; gaming keyboards often handle 10+ (NKRO).
Event log
The page captures keys so shortcuts like F5 or Ctrl+P don't fire while testing. Your system still keeps a few (Windows key, Alt+Tab, Ctrl+W, Fn). Tab is captured the first time, then moves focus as usual. Nothing you type is stored or sent.