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SPCXTools

Keyboard Test

Press keys to check that every one registers — find dead, stuck or ghosting keys in seconds.

Runs locally — files never leave your device

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How to use Keyboard Test

  1. 1Press any key on your keyboard. It lights up on the on-screen layout while held down.
  2. 2Keys that have worked turn green, so you can see at a glance which ones you haven't tested yet.
  3. 3Look at the panel below for the key's key, code, keyCode and location (left, right or numpad).
  4. 4Hold several keys at once to check how many simultaneous presses your keyboard supports. Click Reset to start again.

Test every key on your keyboard

Whether you spilled coffee on your laptop, bought a second-hand mechanical keyboard or are troubleshooting a game that misses inputs, this keyboard test shows exactly which keys work. Each press lights up the matching key on a full on-screen layout, and tested keys stay green, making it easy to find any key that doesn't respond. The test runs entirely in your browser; nothing you type is recorded.

What the keyboard tester shows

  • Live key highlighting on a full-size layout with function keys, navigation cluster and arrow keys.
  • Tested-key tracking, with a counter of how many keys you have checked.
  • Technical details for the last key pressed: the key value (the character produced), the physical code, the legacy keyCode, and whether it was the left or right key (useful for Shift, Ctrl and Alt).
  • Rollover measurement — the maximum number of keys registered at the same time.

When to use a keyboard test

Checking a new or used keyboard. Run through every key before the return window closes. Pay special attention to keys you use less often, like F-keys, the right-hand modifiers and the navigation cluster.

After a spill or cleaning. Liquid damage often affects a group of keys on the same circuit. If several neighbouring keys fail, the membrane or controller is probably damaged.

Repeating or chattering keys. If a single press types a letter twice, the switch may be "chattering" — common with worn mechanical switches. Watch whether the key flickers on and off when pressed once.

Gaming. Hold the combinations you actually use, such as W + A + Shift + Space, and confirm each key registers. If some don't, the keyboard has limited rollover in that area.

Troubleshooting dead keys

  1. Test on another device or in another browser to rule out software or driver issues.
  2. Check layout and language settings in your operating system — a wrong layout changes which character is typed, but the key still lights up in its physical position here.
  3. Disable features such as Filter Keys or Sticky Keys in accessibility settings, which can delay or ignore presses.
  4. Clean under the keycap with compressed air; debris is the most common cause of unresponsive keys on mechanical keyboards.
  5. Replace the switch or keyboard if the key still fails on every device.

Testing other hardware? Try the Mic Test, Webcam Test or Touch Screen Test.

Frequently asked questions

How do I know if a key is broken?
Press it firmly. If the key never lights up on screen, the keyboard isn't sending a signal for it — the switch, membrane or connection may be faulty. If a key stays highlighted after you let go, it may be stuck. Try another USB port or cable, or a different computer, to rule out software issues.
Why don't some keys like Fn, Print Screen or media keys show up?
The Fn key is handled inside the keyboard itself and never sends a key code to the computer. Some keys, such as Print Screen, the Windows key or volume keys, may be intercepted by the operating system before the browser sees them. That is normal and does not mean the key is broken.
What is key rollover and ghosting?
Rollover is how many keys a keyboard can register at the same time. Many office keyboards handle only 2–6 keys in certain combinations; gaming keyboards often support "n-key rollover" (every key at once). Ghosting is when pressing several keys produces an extra, unpressed key or drops one. Hold combinations you use in games and check the count.
My keyboard has a different layout. Does the test still work?
Yes. The test uses physical key positions (code), which are the same on QWERTY, AZERTY, QWERTZ and other layouts, so each key lights up in its physical place. The key value shows the character your current layout produces.
Does this work with laptop and Bluetooth keyboards?
Yes. Any keyboard that types into your browser can be tested — built-in laptop keyboards, USB, wireless and Bluetooth models.
Are my keystrokes recorded?
No. Key presses are only shown on this page and are never stored or sent anywhere.

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