Keyboard Tester
Press any key to check it works.
Ready.
Every test runs inside your browser. Nothing you type, say, show or press is uploaded.
How to use this test
The keyboard tester shows a virtual keyboard that lights up as you press keys, so you can find keys that don't register, keys that stick, and how many keys the keyboard can report at the same time. Switch between the ANSI and ISO layouts to match your keyboard.
Click the virtual keyboard so it has focus, then press each key on your physical keyboard. A key sinks while you hold it and keeps a small orange light once released, so you can see at a glance which keys have been tested. Hold several keys together to see the rollover count.
What the results mean
Any key that never lights up isn't reaching the browser. The rollover number is the most keys the browser saw held at once; 6 is common for basic keyboards, and full n-key rollover shows a higher number. Some keys, such as Print Screen or the Windows key, are handled by the operating system and may not appear.
Common questions
A key lights up twice when I press it once.
That's key chatter: a worn switch that bounces and sends two presses. Cleaning the switch sometimes helps; on a mechanical keyboard the switch can be replaced.
Which layout should I pick?
ANSI is the US-style layout with a wide, single-row Enter key. ISO has a tall two-row Enter and an extra key next to the left Shift. Pick the one that matches your keyboard so the right keys are drawn.
The Fn key does nothing.
Fn is handled inside the keyboard and never sent to the computer, so no keyboard tester can see it. Test it by pressing an Fn combination such as a brightness or volume key instead.