Test your keyboard
Press keys and see them light up — spot a dead key in seconds.
Click “Start testing”, then press every key you want to check.
Keys turn yellow while held and stay green once tested. While testing, this page blocks the browser’s own shortcuts (F5 refresh, Ctrl+F find, Backspace back...) so they register here instead — click "Stop testing" to get them back. A few keys are reserved by the browser or operating system and never reach any page (often Windows/Command, Fn, closing or switching tabs, and screen brightness or volume keys).
A key that stops working is easy to suspect and annoying to prove, especially the ones you rarely press. This shows the whole keyboard and lights each key as it arrives.
Keys turn yellow while held and stay green once tested, so you can sweep the board and see at a glance what never registered. The panel also shows what the browser received: the character, the physical key code and the legacy key code.
That last part is useful beyond broken hardware — it tells you what a key is actually sending when a shortcut or a game refuses to recognise it.
How to use it
- Click “Start testing”.
- Press every key you want to check.
- Look for keys that never turned green.
Frequently asked questions
Some keys do nothing — is my keyboard broken?
Not necessarily. The operating system swallows some keys before any page sees them: the Windows or Command key, Fn, and the brightness and volume keys are the usual suspects.
The layout doesn’t match my keyboard.
The drawing is a standard US layout, but keys are matched by physical position, so an AZERTY A lights up the same key as a QWERTY Q. The label differs, the position doesn’t.
Can it test key rollover (several keys at once)?
Partly: hold several keys and watch how many light up together. Some keyboards can only report a few simultaneous presses, which is exactly what you’ll see.
Does it record what I type?
No. Key events are handled in the page and nothing is stored or sent. Don’t type your password in any keyboard tester, here or anywhere else.
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