Keyboard Tester
Press any key and watch it light up. Find dead or stuck keys, and test anti-ghosting and rollover.
A keyboard tester checks that every key on your keyboard registers, helps you spot a dead, stuck or chattering key, and lets you test anti-ghosting and N-key rollover for gaming. Everything runs in your browser — nothing to install.
Finding dead or stuck keys
Focus the test area and press each key. Every key you press is highlighted and marked tested, and the counter tracks how many of the full 104 keys you've covered. A key that never lights up isn't registering; a key that stays lit after you release it may be physically stuck.
Testing rollover and ghosting for gaming
For gaming, what matters is how many keys register at once — you might hold W, Shift, Space and a number key together. Hold several keys down and watch the "Max rollover" count. If it caps low, some presses are being dropped (ghosting). If it reads 10 or more, your board has full N-key rollover. Shopping for a better one? See our best gaming keyboard guide.
Frequently asked questions
How do I test my keyboard?
Click the keyboard area to focus it, then press every key one by one. Each key lights up on the on-screen layout and is marked as tested, so any key that doesn't light up is one that isn't registering — a fast way to find a dead or unresponsive key.
What is anti-ghosting and N-key rollover?
Rollover is how many keys your keyboard can register at the same time. 'Ghosting' is when pressing several keys at once causes some to drop or phantom keys to appear. Hold down several keys together and watch the 'Held now' and 'Max rollover' counts — a keyboard that reads 10+ simultaneous keys has full N-key rollover (NKRO); cheaper boards often cap at 6 or fewer.
Some keys don't register — is my keyboard broken?
Not necessarily. A few keys are reserved by your browser or operating system — F5, F11, F12, the Windows/Meta key and some Fn combinations — and can't be captured by a web page. If an ordinary letter, number or modifier key fails to light up, that key or its switch may genuinely be faulty.
Does the keyboard tester work for laptops and any layout?
Yes. It works with any USB, Bluetooth or built-in laptop keyboard. The on-screen layout is a standard full-size (104-key) board, but it identifies keys by their physical position, so it recognises your keys even if your layout differs slightly.
Why test my keyboard online?
It's the quickest way to confirm a new or used keyboard works before you rely on it, to diagnose a stuck or chattering key, or to check rollover before buying a board for gaming — all with no software to install.