Keyboard Test
Press every key to verify registration, key rollover, and ghosting visually.
Works with any keyboard layout
Keyboard Key & Layout Tester
Test individual keys, combinations, and sticky key behavior. Supports standard QWERTY, AZERTY, and Arabic 101 keyboard layouts.
Press any key on your physical keyboard to test responsiveness and identify unregistered keys.
Interpreting Keyboard Key Feedback
Keys change color upon being pressed. If a key fails to light up after multiple firm presses, inspect for physical dust or contact failure.
Notice: Certain operating system hotkeys (like Ctrl+Alt+Del, Alt+Tab, or Command+Q) are intercepted by your OS and will not register inside any browser webpage.
Keyboard Troubleshooting Steps
- Disconnect and reconnect the USB cable or wireless dongle.
- Test in an incognito window without browser extensions that hijack keyboard shortcuts.
- For laptops, inspect keys for debris or crumbs beneath the keycap mechanism.
How to Test
- •Click the test area and press each physical key on your keyboard.
- •Highlighted keys have registered; keys that stay dark are not being received.
- •Hold multiple keys together to check rollover behavior.
Browser Limitations
- •Multimedia and Fn-only keys may be captured by the operating system before the browser.
- •On some laptops the embedded controller filters certain key combinations.
Troubleshooting Tips
- •Test in another browser to rule out extension interference.
- •Wireless keyboards: replace the battery and re-pair the dongle.
About the Keyboard Test
The Keyboard Test listens to the key events your browser receives and lights up every key it sees pressed, so you can walk the entire layout and confirm each key actually reaches the computer. If a key stays dark, the failure is somewhere between the switch and the browser — and this page narrows down where.
It is equally useful for checking a keyboard you just bought or received back from repair: run through every key, hold your usual multi-key combinations, and you will know within a minute whether anything sticks, drops, or double-fires.
Tips for a reliable result
- Click the test area once so it has keyboard focus, then press every physical key in turn — including Shift, Ctrl, Alt, Enter, and the whole modifier row.
- Test in a steady rhythm rather than one fast sweep; intermittent contacts show up under repetition.
- Hold three, four, or five keys together the way you would while gaming or using shortcuts to see which combinations your keyboard reports simultaneously.
- If a key never lights up here or in any other app, try the keyboard on another computer to separate a hardware fault from a system setting.
- Test in a private window if keys behave oddly — a few browser extensions intercept keyboard input.
Common problems and fixes
A key never lights up
Clean around the switch with compressed air — debris is the most common cause of a single dead key. If cleaning does not help, the switch or its membrane has likely failed; the dark key on this page is your evidence for a warranty claim.
One press lights the key up twice
That is switch chatter, a classic symptom of a worn or dirty switch. If it repeats consistently across a few presses, the keyboard needs repair or replacement — the record here documents it.
A key stays lit after release
Stuck-on highlighting means the browser never saw the key-up event: the key physically stuck down or the release was swallowed. Press the key again firmly; if it keeps happening, the switch mechanism is failing.
Multimedia, Fn, or macro keys do nothing
That is expected for many of them: operating systems and embedded laptop controllers capture volume, brightness, and Fn-only keys before any browser can see them. A missing media key here is not proof the key is broken.
Notes for specific systems
Windows
- If no keys register at all, check Device Manager for warnings under "Keyboards" and "Human Interface Devices".
- Filter Keys (Settings → Accessibility → Keyboard) can ignore brief or repeated presses — turn it off while testing.
macOS
- Check System Settings → Keyboard → Input Sources if specific characters produce the wrong symbols — that is a layout setting, not a hardware fault.
- Slow Keys and Sticky Keys (System Settings → Accessibility → Keyboard) change how presses register; disable them for a clean test.
FAQ
Can this test damage my keyboard?
No. The tester only listens to the events your operating system already produces when you type — it never sends anything to the keyboard.
Does it detect stuck keys?
Yes. Keys stay highlighted while the browser considers them held, so a key that never releases stays visibly lit and a key that never registers stays dark. Both are visible at a glance.
Can I use this to test a new keyboard before the return window closes?
That is exactly what it is for. Walk through every key, hold the multi-key combinations you actually use, and keep a screenshot as a record if something is wrong.
Why do some keys never register here?
Media, brightness, Fn-only, and macro keys are usually captured by the operating system or the laptop’s embedded controller before the browser sees anything. If they work in no app at all, then look at hardware.
Does this measure my keyboard’s rollover limit?
It shows which keys report together, so you can see how the combinations you actually use behave. Full n-key rollover depends on the connection type and the keyboard’s firmware — treat this page as a practical check, not a certification.