Keyboard Tester — Check Every Key, Code & Ghosting

How to use

1. Click once anywhere on the page so it receives keyboard focus.
2. Press keys and watch the on-screen layout light up per keydown.
3. Hold two to four keys together and read the simultaneous counter for ghosting.
4. Review the log (key · code · keyCode) and press Clear between rounds.

About this tool

A keyboard with a chattered key or a membrane board that drops simultaneous presses shows its faults only under real typing. This tester recreates a full QWERTY layout on screen and lights up every key the instant your browser receives its keydown event, using the hardware-level event.code so physical keys are identified correctly regardless of your operating-system layout. Below the keyboard, a running log records each press with its key name, code and legacy keyCode, while a simultaneous-key counter tracks the maximum number of keys held at once — the quick way to expose ghosting and n-key rollover limits. Best used with a physical keyboard; tapping the on-screen keys works but tests nothing but the touch layer.

FAQ

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