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Keyboard Test
Press any key — it lights up green. Pressed keys stay marked, so any key that never lights up is likely dead. Find stuck and double-pressing keys too.
Press any key…
Last key: — ·
Keys pressed: 0
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How to test your keyboard
- Click anywhere on this page once so it has focus.
- Press every key, one by one. Each lights up green and stays marked.
- Any key that never lights up is dead. A key that stays lit after release is stuck.
- Use Reset to start a fresh test.
Common keyboard problems
A key does nothing
If it never registers here, the switch or membrane under that key has likely failed. On laptops, debris under the keycap is a common cause.
A key types twice (chatter)
If one press shows as two in the last-key readout, the switch is "chattering" — common on worn mechanical switches.
Frequently asked questions
How do I find a dead key?
Press every key once. Any key that never turns green is not registering.
Does this detect key ghosting?
Hold several keys at once — if some don't light up together, your keyboard has limited rollover (ghosting).
Next: Test your mouse →