Keyboard Ghosting Test
Press keys together to measure rollover and spot dropped keys live.
Why keys disappear
Most keyboards read keys in a grid, not one by one. Cheap grids drop a third key when two share a row and column, which is exactly what this test exposes. Try W + A + S, then Q + W + E, then a full row.
This page never sends keystrokes anywhere. Everything stays in your browser.
Test keyboard ghosting
- Click the test area and press keys one by one to confirm each registers.
- Hold 3, 4, then 6 keys together and watch the max-held counter.
- If a key you are holding stays dark, your keyboard dropped it: that is ghosting.
Ghosting questions
What is keyboard ghosting?
Ghosting is when a keyboard fails to register a key because too many keys are pressed at once. The held key looks fine to you, but the computer never receives it.
What do anti-ghosting and n-key rollover mean?
Anti-ghosting designs the key grid so common gaming combos always register. N-key rollover goes further: every key is read independently, so any number of simultaneous keys works.
Which combos should I test for gaming?
Test your real combos: W, A, S, D plus Shift and Space, then add Q, E and R. If those six all light up, your keyboard survives actual gameplay.