Keyboard Test

Check that every key on your keyboard works. Press any key and it lights up on the on-screen keyboard below and stays marked as tested — so stuck, dead and ghosting keys are easy to spot. Each key's name and code are shown too. Free, instant, nothing to install. Free on LK Forge — no sign-up.

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Last key
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event.code
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keyCode
Keys held now: 0 Tested: 0 / 0

Click the keyboard once so the page has focus, then press keys. Hold several at once to check for ghosting. A few keys (F5, F11, F12 and some OS shortcuts) are reserved by your system and can't be captured here.

How to Test Your Keyboard

The test matches keys by their physical position (event.code), so it works the same on any language layout.

1

Press every key

Work across the keyboard row by row. Each key you press turns red and stays highlighted, and the counter shows how many of the keys on screen you've tested.

2

Spot dead and stuck keys

A key that never lights up is dead — it isn't registering. If "keys held now" stays above zero when your hands are off the keyboard, a key is stuck down. Both mean a hardware fault.

3

Check ghosting & rollover

Hold several keys at once and watch "keys held now". If it stops climbing, your keyboard can't report that combination — that's ghosting, common on membrane keyboards during fast gaming.

Frequently Asked Questions

How do I test my keyboard?
To test your keyboard, click the on-screen keyboard once so the page has focus, then press every key in turn. Each key you press lights up and stays marked as tested, so any key that never lights up is not registering. The counters show how many of the on-screen keys you have covered and how many are held down right now. Each key's name and code are shown as you go, which helps when a key reports the wrong character.
How can I tell if a key is stuck or dead?
A dead key never lights up when you press it, which means the keyboard is not reporting it at all. A stuck key shows as held down even when your hands are off the keyboard, so the keys held now count stays above zero. Both point to a hardware fault rather than a browser problem. Debris under a keycap is a common cause, so it is worth cleaning the switch before replacing anything.
What is keyboard ghosting?
Ghosting is when a keyboard fails to register some keys while several others are held at once. Hold a few keys together and watch the keys held now number: if it stops climbing, your keyboard cannot report that combination. Membrane keyboards commonly cap out at around three simultaneous keys, which is why the limit shows up during fast gaming. Keyboards sold as N-key rollover report every key you press at once and will not ghost.
Why don't F5, F11 or F12 work in the test?
F5, F11 and F12 are claimed by the browser or the operating system before the page ever sees them. F5 reloads the page, F11 toggles full screen and F12 opens developer tools. That is a browser rule rather than a fault in your keyboard or in the test. Almost every other key, including the modifiers and the number pad, can be tested normally.