Press any key and watch it light up on the virtual keyboard below — per-key press counters, rollover check and a live key log, right in your browser.
Last key: —Press any key…
The OS may act on some keys (Win/Cmd, media keys) — a browser page cannot fully block those.
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The tester shows whether your browser receives every key press: letters, numbers, modifiers, F-keys, navigation cluster, arrows and the numpad. Each key lights up while held, stays tinted once seen, and carries its own press counter — so a dead, bouncing or chattering switch is obvious in seconds.
Press each key once, slowly, and watch the counters: a key that counts twice per press is chattering (switch bounce), a key that never lights up may be dead, remapped or blocked by software. Sticky keys show up as a highlight that never turns off.
Hold several keys at once and check Max at once. Budget keyboards often register only 6 keys plus modifiers (6KRO); gaming keyboards with N-key rollover register everything. If a combination refuses to register, that's ghosting — a matrix limitation, not a broken key.
Switch the on-screen layout to match your board: full-size with numpad, tenkeyless, or compact 60%. Counters carry across views, and keys that exist only on bigger layouts still count — the last key readout shows every code your keyboard reports, including media keys.
Movement, ability combos and push-to-talk all fail silently when a switch degrades. A quick pass before a session confirms WASD, Shift, Space and your macro keys all register — and the rollover check proves your combos physically can't drop inputs.
Dust and debris under a keycap cause missed or repeated presses; compressed air and a keycap pull often fix it. If a key fails in every app and this test, try another USB port, disable vendor software remaps, and on mechanical boards consider swapping the switch.