Keyboard tester
Press each key on your keyboard. Keys light up while you hold them and stay marked once tested, so a key that does not register stands out.
- Keys tested
- 0
- Held now
- 0
- Most at once
- 0 your keyboard’s rollover
Press any key.
Other keys pressed: none.
How to test your keyboard
Press every key once, row by row, and watch the keys on the screen fill in. A key that stays blank after you press it did not reach your computer. Hold a key down to see it light up for as long as you hold it, and let go to see it come back. The line under the keyboard shows exactly what your browser received: the character, the key's name and, for keys that appear twice, whether it was the left or the right one, or the number pad.
To check how many keys your keyboard can report at once, hold down as many keys as you can together, for example A, S, D, F, J, K, L and the space bar. "Most at once" shows the highest number it reported. Cheaper keyboards often stop at two to six keys, and only in some combinations, which is called ghosting; many gaming keyboards report every key. For everyday typing, even fast typing, you rarely press more than two or three keys together, so a low number is only a problem in games.
When a key does not work
- Try it somewhere else. Press the key in a text editor or another browser. If it works there, a program or a keyboard shortcut is catching it before the page.
- Clean under it. Crumbs and dust under a key are the most common cause of a key that works only when pressed hard. Turn the keyboard over and shake it, or blow air under the key.
- Check the connection. Unplug and reconnect a wired keyboard, try another USB port, or charge and re-pair a wireless one.
- Check the layout. If a key types the wrong character, your computer's keyboard layout may differ from the one printed on the keys. The tester follows the key's position, so it still shows which physical key you pressed.
Some keys never reach a web page at all: the Fn key on laptops, many media and brightness keys, and shortcuts the system keeps, such as the Windows key combinations. That is normal and does not mean the key is broken. When everything works, measure what your fingers can do with a one-minute typing test.
Questions
Why does a key not light up?
Either the key sends nothing, or the system keeps it for itself before the browser hears it: Fn and many media keys never reach a web page, and the Windows or Command key may open a menu. Try the key in another program; if it fails there too, clean under it or reconnect the keyboard.
What does "most at once" mean?
The largest number of keys your keyboard reported held down together. Many office keyboards stop at a few keys (often in some combinations only), while many gaming keyboards report every key. For typing, six is plenty.
Does it work with my layout?
Yes. In Chrome and Edge the keys show your own layout’s letters (AZERTY, QWERTZ and others); in other browsers they show US labels, but every key still registers by its position.
Is anything I type recorded?
No. The tester runs in your browser and sends nothing anywhere.