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QUEST · LV.03

Keyboard test

Press each key and watch it light up. Dead, stuck or double-typing keys are easy to spot.

Runs in your browser · Nothing uploadedFree · No install

Keyboard test

Click here, then press keys

Tested
0 / 0
Max at once
0
Presses
0
Last key
—

Key log

Win/⌘, Print Screen, Fn and some F-keys are handled by your system and may not light up — that’s normal, not a fault.

Result

Not tested

Waiting for you to start the test.

How to use

  1. 1Click the keyboard picture so it can listen to your keys.
  2. 2Press every key you use. Tested keys turn green.
  3. 3Tell us if any key didn’t respond.

Troubleshooting guide

The FreeComTools mascot pressing a big mechanical keyboard to find a faulty key

What the keyboard tester detects

  • Dead keys — keys that never light up when pressed.
  • Stuck keys — keys that stay “down” (red) after you let go.
  • Chatter (double typing) — one press registers twice. The key turns amber and is listed in the result.
  • Rollover — how many keys can be held at once. Gaming keyboards often support 6 or more; many office keyboards stop at 2–6 in certain combinations (“ghosting”).

How to test properly

  1. Click the keyboard picture. While it has a blue outline, every key you press is captured instead of controlling the page.
  2. Press each key you use, one at a time. Tested keys turn green.
  3. For gaming, hold combinations like W + A + Shift + Space and watch “Max at once”.
  4. Hold Esc for one second (or click outside) to stop capturing.

Keys that won’t light up — and why that can be normal

Some keys are taken by the operating system before the browser ever sees them: the Windows/⌘ key, Print Screen, Fn and media keys, and sometimes F11/F12. The Korean 한/영 and 한자 keys are shown on the right Alt and right Ctrl positions; depending on your system they may arrive as different codes. If these keys work in other apps, the keyboard is fine.

Fixing dead, stuck or double-typing keys

  • Unplug the keyboard and turn it upside down; gently tap out crumbs. Use compressed air around the problem key.
  • For sticky keys after a spill, unplug immediately and let it dry for 24–48 hours.
  • Try another USB port, and avoid unpowered hubs. For wireless keyboards, replace the batteries and re-pair.
  • Chatter on mechanical keyboards is often fixed by cleaning the switch, a firmware “debounce” setting, or replacing that one switch (hot-swap boards make this easy).
  • If a whole row or block of keys fails together, it’s usually the internal circuit or cable — repair or replacement is likely needed.

Laptop keyboards

If the built-in keyboard fails but an external USB keyboard works, the problem is the laptop keyboard or its ribbon cable. If both fail, check for a driver or system issue: restart, and in Windows Device Manager uninstall the keyboard device and reboot to reinstall it.

Frequently asked questions

Does the keyboard test record what I type?

No. Key presses are shown only on your screen and are never sent or saved. The log disappears when you leave the page.

Why does Tab or F5 not do anything while testing?

While the tester is active, it blocks the browser’s normal shortcuts so you can test those keys. Hold Esc for one second or click outside to return to normal.

Does it work with Korean or other layouts?

Yes. Keys are detected by their physical position, so any layout works. Switch on “Hangul legends” to show Korean 2-beolsik letters.

Can I test a phone or tablet keyboard?

On-screen keyboards don’t report physical keys, so results are limited. The test is designed for physical keyboards on a computer.

What is key chatter?

Chatter is when a worn or dirty switch makes one press register as two. It’s common on older mechanical keyboards and mice.

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