Dead Key Test: Online Keyboard Test for Broken Keys

Dead Key Test: Press Each Key on the Virtual Keyboard

Click the page once so it has browser focus, then press each key in turn. The virtual keyboard map reacts in real time: working keys turn green, a key you hold shows red, and any key that stays dark never reached the browser. A stats panel reports active keys, total presses and scan rate, and the Reset button clears the board for a fresh run. The keyboard rollover test runs entirely in your browser, so nothing you press is stored or sent anywhere.

1. Click the page, then press the first key on your keyboard.
2. Watch the keys light up on the on-screen keyboard.
3. Release anything held down, then keep going until every key is green.

Test Every Key with the Keyboard Checker

Typing in Notepad hides the top row and tells you nothing about a stuck one, so test every key here instead. Use this keyboard checker as a keyboard test online whenever you need to test keyboard behaviour: test your keyboard before a long session, run one keyboard test after a repair, and check keyboard health on a secondhand model. You can also test key by key if only one feels off.

Function Keys, Numpad and Arrow Keys

• Function keys F1 to F12 cannot be tried in a document, so press them here.
• The numpad lights up on the same board, and the mouse buttons shown below it are clickable.
• Arrow keys, Space, Enter, Ctrl, Shift and Caps Lock deserve an early press, because you use them most.

What a Keyboard Tester Detects: Dead Keys, Double Keys and Ghosting

A dead key gives no response when pressed. Double keys type two characters from one press, a common sign of typing problems. Ghosting happens when you hold several keys and some are dropped, which hurts most in fast-paced gaming. If a gaming keyboard claims full rollover, hold many keys together and confirm every one stays active; software cannot fix a board that drops key combinations. The keyboard key drop test runs entirely in your browser, so nothing you press is stored or sent anywhere.

N-Key Rollover and Key Combinations

N-key rollover means each key is read separately while others stay held down. Most office boards manage only a few at once, so try pressing three or four keys together and watching all of them stay lit.

Test Your Keyboard for a Dead Key: An 87-Key Walkthrough

My question is narrow: is the D on a tenkeyless board really failing, or is it the typing app? I open the tester, click the page, and press D exactly 25 times, counting aloud.

The stats panel logs 17 registered presses out of 25, a 68% hit rate, and the key flickers between green and dark. A fully dead key never lights; this one is intermittent, which points at dust or a worn contact rather than a broken switch. Every neighbour (S, F, E, C) lit on all 25 presses, so the fault is local to that key.

I tip the board, use compressed air, and rerun the same 25 presses:

The number to watch is the single miss in the second run. One miss in 25 would be tolerable on a spare board, but I type all day, so I treat anything below 100% as a failing switch to watch, not a pass. The keycap refit mattered most: the stem was seated crooked.

Next comes the check I care about as a gamer. I hold W, A, S, D, Q and E together, which is six regular keys, and all six stay lit. Adding R drops one, because this board reports only six regular keys at a time, the standard limit of the USB boot protocol (modifiers like Shift and Ctrl sit outside that count). That is a design limit, so replacing a key would not change it.

One edge case: the Fn key never appears on the map, because the firmware handles it before the browser sees it. A dark Fn is therefore not proof of a dead key, so test it by watching what the F-row does when you hold it. Judging by the rerun, the board stays in service, and I will repeat the 25-press run monthly.

Fixing an Unresponsive Key: Hardware Issue or Damaged Contacts

An unresponsive key that stays dark on every setup points to a hardware issue. Start with the cheap causes:

• Dust or crumbs under a sticking key: tip the board over and use compressed air; after a spilled drink, careful cleaning with a dry cloth helps.
• A keycap seated badly: pull it off and refit it.
• A hot-swappable switch: reseat it. A dead switch or a damaged one needs replacing.
• A connection issue: swap the cable, try another USB port, and test a wireless keyboard on fresh batteries.

If the key still fails, check your warranty. Brands such as Dell, Asus and HP cover faults for a set period, and a replacement keyboard costs less than a repair at most price points. A stale driver can mimic a fault, so update your software too.

Troubleshoot Keyboard Layout and Browser Focus

A wrong letter often means the keyboard layout is set incorrectly; pick English QWERTY in settings and test again. If nothing lights up, click the page first, because the tester needs focus. Ergonomics matters too: a worn board is worth replacing.

Which Devices Can Find Dead Keys with This Tool

The tool runs in Chrome, Edge and Safari on Windows and Mac, with no extra setup. The keys you do not have simply stay grey.

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