Keyboard Test

How to Use This Test

1. Click once inside the test area to give it focus — the browser can't detect keypresses without this.
2. Press each key individually. Each one lights up green when it registers.
3. Any key that stays grey after you press it is not registering — that's a dead key.
4. Check the Last key readout. If you pressed once and it shows a double entry, that key is chattering — registering two signals from one press.
5. To test rollover, hold several keys at once — W, A, S, D, Shift, and Space is a good test. See how many stay lit simultaneously.
6. Click Reset to clear all highlights and run a fresh test.

What Your Results Mean

All keys light up when pressed: Your keyboard is fully functional — every switch or membrane contact is working correctly.

One or more keys stay grey: Dead keys — not registering any input. The switch beneath them has failed, or debris is blocking the contact.

A key turns green and stays lit after release: The key is physically stuck down. Something is preventing the keycap from returning to its resting position.

Last Key counter shows 2 for a single press: Key chatter — the switch fires two electrical signals from one physical press. Most common on worn mechanical switches.

Holding several keys drops some from the display: Your keyboard has limited rollover. Budget and office keyboards often block certain multi-key combinations. Gaming keyboards with N-key rollover handle everything at once.

Fn and media keys don't appear: Normal. These are intercepted at the firmware or OS level before reaching the browser. Their absence from this test doesn't mean they're broken.

Common Problems and Fixes

A key won't light up at all

Try cleaning it first — blow compressed air into the gap around the key. On mechanical keyboards, pull the keycap and check the switch stem for debris. On laptop keyboards, a business card inserted along the key edge can dislodge trapped material.

Multiple keys stopped working after a liquid spill

Unplug the keyboard immediately and do not keep using it. Turn it upside down and let it dry for at least 24 hours. Sugary spills can be rinsed carefully with distilled water — not tap water — but this is a last resort.

Keys type the wrong characters

This is almost always a keyboard layout mismatch. A UK keyboard set to US layout swaps @ and " among other symbols. On Windows: Settings → Time & Language → Language → your language → Keyboards. On Mac: System Settings → Keyboard → Input Sources.

Key chatter on a mechanical keyboard

Try cleaning the affected switch with a small amount of electronic contact cleaner applied into the switch housing while actuating it rapidly. If chattering returns, the switch is worn and needs replacing.

Keyboard not responding in the test at all

Click in the test area first to give it focus. For wireless keyboards, check battery level and pairing. On Windows, open Device Manager and check the Keyboards section for driver errors.

Why This Test Matters

For anyone buying a second-hand keyboard or laptop, running through every key before paying takes under two minutes and gives you evidence of any dead keys. After a liquid spill, keyboards often appear fine initially but develop contact corrosion under specific keys within days. Testing here a few days after a spill gives you an honest assessment.

For gaming, rollover is a direct performance issue. If your keyboard can't register W, A, S, D, Shift, and Space simultaneously, inputs will drop in fast-paced games. Testing takes 10 seconds.

Why Keyboard Problems Happen

Keyboard faults split into two camps: a key that does nothing, and a key that does the wrong thing. These six causes cover almost everything.

1. The layout or language is wrong. If pressing @ gives ", or # gives £, your hardware is fine — Windows is using the wrong keyboard layout (the classic US vs UK swap). On Windows 11 24H2, go to Settings → Time & language → Language & region, click the "…" beside your language → Language options, and set the correct keyboard; you can also cycle layouts instantly with Win+Space. On macOS Sequoia: System Settings → Keyboard → Text Input → Input Sources → Edit, then add or reorder the right layout.

2. An accessibility feature is interfering. Filter Keys can make presses feel ignored, and Sticky Keys changes how modifiers behave. On Windows 11: Settings → Accessibility → Keyboard, and switch off Filter Keys and Sticky Keys. On macOS Sequoia: System Settings → Accessibility → Keyboard, and turn off Slow Keys and Sticky Keys.

3. Debris or a worn switch. A key that's dead, mushy, or types twice is often physical — crumbs under a laptop key, or a worn switch "chattering" on a mechanical board. Double characters from one tap are the classic worn-switch signature.

4. A driver hiccup. On Windows, right-click Start → Device Manager → expand "Keyboards," right-click the entry and Uninstall device, then reboot — Windows reinstalls the standard driver cleanly on restart, which clears a surprising number of "half the keys stopped" issues.

5. Ghosting and rollover limits. Budget keyboards can only register a handful of simultaneous keys, so in games some combinations silently drop. That's a design limit, not a fault — this test will show you exactly which combinations your board can hold at once.

6. A flaky connection. For wireless keyboards, a low battery or a 2.4 GHz dongle crowded next to a USB 3.0 port causes dropped or repeated keys; move the dongle to a front port or a short extension. For Bluetooth, re-pair if input stutters. On laptops after a spill, a partially-seated or corroded ribbon can disable a whole region of keys.

It Works Here But Not in My Game or App

If every key lights up on this page, the keyboard and its driver are healthy, so a problem inside one program is that program's input handling — not your hardware.

The usual culprits are in-app key bindings (a game where movement was rebound, or a conflicting macro in software like Razer Synapse or Logitech G HUB), Sticky Keys triggering mid-game from tapping Shift five times, or an app that reads input through a method some keys bypass. Open the game or app's own control/keybinding settings and confirm the keys are mapped where you expect, disable any overlay macro software, and turn off Sticky Keys. Because this page reads input at the browser level with nothing remapped, it's the clean reference point: pass here, and you know the fix is in the app.

How to Get the Best Keyboard Results

1. Go row by row, pressing each key once. Watch the on-screen key light up. Working methodically catches a single dead key you'd otherwise miss in normal typing.
2. Test your gaming cluster together. Hold W, A, S, D plus Shift and Space at once. If any fail to light, that's a rollover limit you'll feel in fast games — useful to know before you blame your aim.
3. Watch for double-registers. Tap a suspect key cleanly several times. Two characters from one deliberate press means switch chatter, not user error.
4. Clean a stuck key properly. Power down, then use compressed air at an angle to blow debris out from under the keycap rather than deeper in. On mechanical boards you can pull the keycap to reach the switch.
5. For wireless, rule out the link first. Swap in a fresh battery or charge it, and move the receiver closer. Many "failing" wireless keyboards are just low on power.
6. After a spill, wait and retest. Corrosion develops over days. Re-running this test a few days later gives a far more honest picture than testing while it's still drying.

Frequently Asked Questions

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