How to use the keyboard tester
- With this page open, press the keys on your keyboard one by one. Each key lights up while it is pressed.
- Keys that registered at least once stay colored. When "Keys tested" matches the total, every key works.
- If a key shows no reaction at all, its switch or connection may be faulty.
- If your keyboard has no number pad (tenkeyless), click "Show TKL" to change the layout.
The Windows key opens the Start menu, and browser shortcuts such as Ctrl+W cannot be blocked by a web page. Test those keys on their own.
What is key chatter?
Chatter is a fault where one key press registers two or more times. If typing "hello" gives you "helllo", chatter is a likely cause. It usually happens when a mechanical switch wears out or collects dust.
This page flags chatter when the same key is pressed again within a very short time (35 ms) after being released, which is almost impossible to do on purpose. If the same key keeps getting flagged, try the fixes below.
What is rollover?
Rollover is how many keys a keyboard can register at the same time. Hold several keys down together and check "Max rollover". Many office keyboards only register 2 to 6 keys in certain combinations, while gaming keyboards often support "N-key rollover", where every key can be pressed at once. It matters most if you play games that need many simultaneous keys.
What to try when a key doesn't work
- Try another USB port: loose connections are a common cause. For wireless keyboards, check the battery and receiver.
- Clean under the keycap: dust can make keys stick or chatter. Unplug the keyboard, remove the keycap and use compressed air.
- Test on another computer: if the same key fails elsewhere, the keyboard is the problem; if it works, check your computer's settings or drivers.
- Check remapping software: make sure keyboard utilities or macros are not changing the key.
FAQ
Can I test a Mac keyboard?
Yes. Click [Mac] below the keyboard to switch to the Mac layout with command (⌘), option (⌥) and control (⌃). The full-size view includes the number pad and F13–F19, and "Show TKL" switches to a compact Magic Keyboard–style layout with the arrow keys inside. If you visit from a Mac, the Mac layout is shown automatically. The fn key never reaches the browser, so it isn't counted.
Can I test keys that are not on this layout?
Yes. Media keys and language keys that are not drawn on the layout are listed under "Keys not on this layout" when you press them.
Is my input saved or sent anywhere?
No. Key presses are processed only in your browser and never sent to our server.
Can I test a laptop keyboard?
Yes. Keys your laptop doesn't have (number pad, Pause, etc.) will simply stay untested. The Fn key is handled inside the keyboard and never reaches the browser.
Once your keyboard checks out, see how fast you are with the typing speed test.