Keyboard Tester
Press keys and watch them light up on the keyboard: find keys that don't work or type twice, see each key's code, and test how many keys your keyboard can register at once.
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Click here (or Tab here), then press keys.Testing: press any keys. Press Esc three times quickly to leave.
- Key presses appear here.
How to test your keyboard
- Choose your layout: ANSI (US) or ISO (UK and Europe).
- Click the test area and press every key; each turns green once it works.
- Hold several keys together to test rollover, and press Esc three times to leave.
How to test a keyboard
Click the test area and press every key: each one lights up while held and turns green once it has worked, so a key that stays grey after you've pressed it isn't registering. A key that types twice from one press (worn switches, often called key chatter) is outlined in red: the tester flags a second press that arrives within 30 milliseconds of letting go, faster than anyone can really press a key. Keys not shown on the layout, such as media or function-lock keys, appear in the log.
Rollover is how many keys a keyboard can register at the same time. Hold down several keys at once (try A, S, D, F, J, K, L together) and see the "most at once" number. Many office keyboards manage 6 or fewer, or fail on certain combinations ("ghosting"); gaming keyboards often handle all of them (N-key rollover). Some keys can't be tested in a browser because the system catches them first, such as the Windows key with others, Print Screen on some systems, Fn, or Cmd+Tab. Keys are only read while the test area is selected, and nothing is recorded or sent.
Questions about keyboards
How do I find a key that doesn’t work?
Press every key. Any key that stays grey after pressing isn’t registering.
Why does a key type twice?
Worn or dirty switches can bounce, called key chatter. The tester outlines such keys in red.
What is key rollover?
How many keys register at once. Hold several keys and read the “most at once” number; gaming keyboards often handle every key (n-key rollover).
What is the difference between ANSI and ISO?
ISO keyboards, used in the UK and Europe, have a tall Enter key and an extra key next to left Shift. ANSI (US) has a wide Enter key.