Keyboard Tester
Press keys to check they register — useful for diagnosing a faulty keyboard.
Finding the dead key
When a keyboard has a key that seems stuck, doubles up, or does not respond, you need a way to see exactly what each key is sending. This lights up each key as you press it, so you can test every key in turn and spot the ones that do not register, register twice, or fire on their own — the tell-tale signs of a hardware fault.
Press each key and watch whether it registers correctly.
What the results tell you
Systematically pressing every key turns a vague this keyboard feels off into a specific diagnosis: a key that never lights up is dead, one that registers twice has a bounce problem, one that lights without being pressed is stuck or shorting. That is enough to decide whether a keyboard needs cleaning, a key needs reseating, or the whole thing needs replacing. It is also handy for confirming a newly-bought or repaired keyboard works fully before you rely on it.
Common questions
How do I test my keyboard?
Press each key in turn and watch whether it lights up, so you can spot keys that do not register, double up, or fire on their own.
What do the faults mean?
A dead key never registers, a doubling key has a bounce fault, and a key firing on its own is stuck or shorting.
Is anything captured or uploaded?
No. Key presses are shown in your browser only.