Keyboard Tester
Press every key on your keyboard. Working keys light up green, the counter shows how many keys your keyboard handles at once, and keys that type twice are marked in red.
- Keys tested
- 0 / 104
- Held now
- 0
- Most at once
- 0
- Double presses
- 0
Other keys detected:
Last key
- key
- —
- code
- —
- held
- —
Keys held right now
This test needs a physical keyboard. On a phone or tablet, connect one over Bluetooth or USB.
How to test your keyboard
- Press each key once, row by row. Every key that works turns green and stays marked, so you can see at a glance which ones are left.
- Do not forget the less-used keys: Caps Lock, both Shift and Ctrl keys, the menu key, Insert, the arrow keys and the number pad.
- To check rollover, hold down as many keys as you can at the same time, for example the whole row from A to L. The “most at once” number shows how many your keyboard reported.
- For gaming, test the combinations you actually use, such as W + A + Shift + Space. If one key in the combination does not light up, your keyboard has ghosting there.
Common keyboard problems
A key does nothing. Dust or a spilled drink can block the switch. On mechanical keyboards, pull the keycap and clean around the switch; on laptops, a short burst of compressed air often helps.
A key types twice. This is key chatter. The double presses counter catches it. Cleaning sometimes helps, otherwise the switch needs replacing — easy on hot-swappable keyboards.
Keys drop out in combinations. That is ghosting or limited rollover. It is a design limit of the keyboard, not a fault, and the only fix is a keyboard with better rollover.
Wrong characters appear. If the right keys light up but the wrong letters appear in other apps, the keyboard layout in your operating system is set to a different language.
Test your typing speed and reflexes
Once every key works, see how fast you can hit one of them with the spacebar counter.