Pick your keyboard
Choose ANSI, ISO or JIS, the size (full, TKL, 60 % or numpad) and PC or Mac so the picture matches your keyboard.
Keyboard Test
Press keys and watch them light up on a full keyboard: every key you test turns green, so a key that doesn’t work stands out at once. Check how many keys register together, spot ghosting, stuck keys and chattering switches, and measure key repeat.
Open Keyboard Test →How to test your keyboard online
Press every key
Each key lights up while held and turns green once it has worked. Keys that stay gray haven’t sent anything.
Check the details
Hold combinations for rollover and ghosting, hold one key for repeat timing, and watch for stuck-key and double-press warnings.
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Keyboard test FAQ
How do I test my keyboard online?
Open this page and press each key. Keys light up while you hold them and turn green once they have worked, so any key that stays gray isn’t sending a signal. The counter shows how many keys of the chosen layout you have tested.
How do I find a stuck key?
A key held down for more than three seconds turns red and a warning names it. If you aren’t pressing it, the key or its switch is stuck. The event log also shows a key that keeps repeating on its own.
What is keyboard ghosting and how do I test for it?
Ghosting (or key blocking) is when a keyboard can’t register some keys while others are held. Pick a combination such as W + A + Shift + Space, hold all of its keys and see whether every one lights up. The result shows how many registered together and which key was missing.
What is N-key rollover?
Rollover is how many keys a keyboard can report at the same time. “Most keys at once” shows the highest number seen. Many office keyboards stop at 2 to 6 keys; gaming keyboards often handle all of them (NKRO). Some keyboards report more keys only in a special mode or over a different connection.
Why does one key type two letters?
That is switch chatter: the contact bounces and the keyboard sends a second press a few milliseconds later. The test flags presses closer than 20 ms (you can change it) and marks the key orange. Cleaning or replacing the switch usually fixes it.
Why don’t Fn, Print Screen or media keys show up?
The Fn key is handled inside the keyboard and is almost never sent to the computer. Some media and system keys, and shortcuts such as Ctrl+W, Alt+Tab or the Windows key, are taken by the system or browser before any web page sees them. Keys the browser does send but that aren’t on the picture are listed under “Keys not on this layout”.
What is the difference between ANSI, ISO and JIS?
They are the three common physical layouts. ANSI (US) has a wide one-row Enter key and a long left Shift. ISO (most of Europe) has a tall Enter and an extra key next to the left Shift. JIS (Japan) adds keys for input-mode switching and has a shorter space bar.
Is anything I type sent anywhere?
No. The test runs entirely in your browser; key presses and the typing area are never stored or sent.
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