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Keyboard Test
Press every key to check it works: each key lights up while held and turns green once tested. See how many keys register at once (rollover), spot keys that type twice (chatter), and read each key’s code.
Keys tested
0 of 104
Most keys at once
0
Key capture is off, so the page scrolls and shortcuts work as usual. Tick “Capture keys” to carry on testing.
While capturing, keys like Space, Tab and F5 are held back so they don’t scroll or reload the page. A few shortcuts, such as Ctrl+W or the Windows key, are kept by the system and can’t be stopped.
Key events
Press a key to see its details.
| Event | key | code | keyCode | Location |
|---|---|---|---|---|
Problems found
No double presses so far. Keys that type twice from one press turn amber here.
Possible chatter: these keys sent a second press within 30 ms of being released.
- ·
Other keys pressed
Media, language and extra keys that aren’t on the drawing.
Rollover check
Hold down as many keys as you can, such as A S D F J K L. Basic keyboards stop at 2 to 6 keys; gaming keyboards with “n-key rollover” count every key. If a key you hold doesn’t light up, your keyboard blocks that combination (ghosting).
Next, check your typing speed with the Typing Test, or test your microphone and webcam.
About the Keyboard Test
The keyboard tester draws a full-size keyboard that lights up as you press each key and turns green once a key works, so dead keys stand out. It counts how many keys register at once (rollover), flags keys that send two presses from one (chatter), and lists each key’s key, code and keyCode for developers. Nothing you type is sent anywhere.
How to use it
- 1 Press each key on your keyboard; it lights blue while held and turns green once tested.
- 2 Keys that stay grey after pressing them may be broken.
- 3 Hold several keys together to see the most your keyboard registers at once.
- 4 Read the key events list for each key’s key, code and keyCode values.
Frequently asked questions
How do I know if a key is broken?
Press it firmly. A working key lights up blue and then stays green. If it stays grey, the keyboard didn’t send anything: try cleaning under the key, another USB port, or, for wireless keyboards, new batteries. If it works only sometimes, the switch is wearing out.
What is key chatter?
Chatter is when one press types a letter twice, usually from a worn or dirty mechanical switch. The test flags a key in amber when it sends a new press within 30 milliseconds of being released, faster than anyone can press it on purpose.
What is key rollover and ghosting?
Rollover is how many keys a keyboard can register at once. Cheap keyboards may stop at 2 or 3 and miss, or “ghost”, certain combinations. Gaming keyboards often have n-key rollover, which registers every key. Hold several keys to find your limit.
Why don’t the Fn or Windows keys show?
The Fn key is handled inside the keyboard and never reaches the computer, so no website can see it; test it by pressing Fn with another key. The Windows key and some shortcuts, such as Ctrl+W or Alt+Tab, are caught by the system before the browser.
Why does Print Screen light up only when released?
Windows sends only a key-up for Print Screen, so the key counts as tested when you let go.
Can I test a laptop or non-US keyboard?
Yes. Keys are matched by their position, not the letter printed on them, so French, German and other layouts light up the same places. Untick “Number pad” for a laptop or tenkeyless keyboard, and tick “Mac keys” for Command and Option labels.
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