Test Your Keyboard Online — Every Key, Ghosting, and Chatter
Find out in a minute whether every key on your keyboard works. Press keys and UtilHub's free keyboard tester lights each one on an on-screen keyboard, so dead, sticky, or unresponsive keys stand out immediately. It also catches problems you cannot see while typing: key chatter, where one press registers twice, and ghosting, shown by how many keys your keyboard reports at once. Every press lists the key, code, and key code, which helps when a key is remapped or a game ignores it. Switch between Windows and Mac layouts, show or hide the numeric keypad, and test laptop, mechanical, and wireless keyboards alike, with nothing to install.
How to use Keyboard Tester
- Click the keyboard area, or simply start typing.
- Press every key once — each key turns green when it registers.
- Hold several keys together to see how many are detected at once.
- Look for keys that never lit up and for amber keys flagged for chatter.
- Press Esc three times to leave the test area, or Reset to start again.
Features
- Every key, visually — A full keyboard with function keys, navigation keys, and an optional numpad for Windows and Mac.
- Chatter detection — Keys that register again within 50 ms of release are flagged, a common fault of worn mechanical switches.
- Rollover count — See the most keys held at once to check for ghosting before gaming or fast typing.
- Key event details — Key, code, key code, location, and hold time for every press, useful for developers and remapping.
Frequently Asked Questions
How do I know if a key on my keyboard is broken?
Press each key once and watch the on-screen keyboard. A key that never turns green is not sending a signal, which points to a hardware fault, a driver problem, or a remapping tool that swallows it. Test the same keyboard on another computer: if the key still fails there, the switch or membrane is the cause.
What is key chatter?
Chatter is when a single press registers as two or more, so "hello" becomes "helllo". It usually comes from a worn or dirty mechanical switch. The tester flags a key when a new press arrives less than 50 milliseconds after release, faster than anyone can double-tap on purpose. Cleaning the switch with compressed air often fixes it.
How do I test for ghosting or N-key rollover?
Hold down several keys at the same time — for example W, A, S, D, Shift, and Space — and watch "Most keys held at once". Many office keyboards report only two to six keys together and drop the rest, while gaming keyboards with N-key rollover register every key. Try the combinations you actually use.
Why don't the Fn, Windows, or Print Screen keys light up?
The Fn key is handled inside the keyboard and never reaches the computer, so no website can detect it. Your operating system also reserves some keys and shortcuts, such as the Windows key or Command+Tab, before the browser sees them, and Print Screen reports only when released. These keys can still work normally.