Keyboard Click Tester — Test Every Key on Your Keyboard

Press Start Test, then press any key on your keyboard. Each key lights up orange on the virtual keyboard when it registers a keydown event. If a key never lights up after pressing it, the switch may be broken or the OS is intercepting the signal.

Some keys (PrintScreen, ScrollLock, certain media keys) are blocked by the OS or browser and will never fire a keydown event. For other keys, if pressing produces no response, the switch is likely failed or the keycap is stuck.

N-key rollover means every key is scanned independently so any number of simultaneous keypresses all register correctly. Hold several keys at once and watch the keyboard — with full NKRO all keys light up simultaneously.

Ghosting occurs when pressing a combination of keys causes a phantom keypress on a key you never touched, or causes a real keypress to be dropped. It happens on keyboards with simple key matrices that cannot handle certain key combinations.

Yes. A small count badge appears on each key showing total presses. If a single physical press shows a count of 2 or more, the switch is chattering — firing multiple keydown events per actuation. This is a sign of a worn mechanical switch.