Free Online Keyboard Tester
Find out if your keys are broken, sticking, or double-typing. Just press any key on your keyboard—if it lights up, it works!
Last Key Pressed
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System Key Code
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Instant Response Check
See exactly when your computer registers a key press. This is perfect for checking if your mechanical switches have input lag or if a key is getting "stuck" when pressed.
Ghosting & Rollover Test
Press multiple keys at the same time to see if your keyboard can handle it. This is great for gamers who need to know if their keyboard has "ghosting" issues.
Frequently Asked Questions
How do I use this keyboard tester?
It's simple! Just start typing on your physical keyboard. If your keyboard is working properly, the corresponding key on our virtual screen will light up and change color.
Why is a specific key not lighting up?
If you press a key and nothing happens on the screen, your computer isn't receiving the signal. This usually means the hardware switch is broken, dirt is stuck under the keycap, or the keyboard cable is damaged.
Does this work for laptop keyboards?
Yes! Our online tool works perfectly for testing built-in MacBook and Windows laptop keyboards, as well as external Bluetooth or USB mechanical keyboards.