Keyboard Tester
Press every key and see it light up on a full keyboard layout to find dead or sticking keys, with key codes and rollover testing.
Runs on your device
What it does
Each key you press is highlighted and stays marked, so after one pass you can see any key that never registered. Press several keys together to test rollover.
How to use it
- Click the keyboard area.
- Press every key once.
- Look for keys that never lit up.
When it helps
- Checking a second hand laptop.
- Testing mechanical keyboards.
- Diagnosing a key that does not type.
Questions
Can I test Fn and media keys?
Only keys the operating system passes to the browser. Fn usually is not reported.
What is rollover?
How many keys register at once. The tester shows how many are currently held down.
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