Keyboard Test | Check Every Key and Rollover Online Free

A keyboard test, or keyboard tester, checks that every key on a keyboard registers correctly, measures how many keys can be held at once, and detects ghosting, where certain key combinations fail to register properly.

The test reads the physical key code your browser receives for every key press and release, independent of your keyboard's language layout, and lights up the matching key on the visual keyboard live as you type.

N key rollover, or NKRO, is how many keys a keyboard can register held down at the same time. Cheap membrane keyboards often cap at 2 or 3 simultaneous keys, which can silently drop an input in a game that needs several keys held together, such as sprinting, jumping, and interacting at once.

Ghosting happens when a specific combination of keys produces a missing or phantom keypress, caused by how a budget keyboard's internal circuit matrix shares rows and columns between keys. A classic example is a movement key silently failing to register while two other keys are held at the same time.

Browsers only send key events to whichever element currently has focus. Clicking the visual keyboard area gives it that focus so your key presses are captured, if you click elsewhere or switch tabs, key events will stop registering until you click back.

Certain key combinations, such as switching windows or locking your screen, are intercepted by your operating system before they ever reach the browser. This is expected behavior and not a sign of a keyboard problem, those specific combinations cannot be tested from any web page.

Ordinary typing rarely holds more than 3 or 4 keys at once, so a normal typing test will not reveal true NKRO on its own. Deliberately press 6 or more keys at the same time, for example A, S, D, F, J, and K together, to properly exercise higher rollover.

Chatter is the opposite of a stuck key, a single physical press registering as two or more rapid keypresses, usually from worn or oxidized switch contacts. It shows up as unwanted duplicate letters while typing normally, worth checking directly in a text field if you suspect it.

Yes. The test reads the physical key your keyboard reports rather than the character it produces, so it works correctly regardless of language layout. Choose the closest match among full size, tenkeyless, or compact so the coverage total lines up with your actual keyboard.

Yes. Laptop scissor switch and butterfly mechanism keyboards work the same way as any external keyboard for this test, since the browser reads the same standard key events regardless of the physical switch type underneath.

Yes, once it is paired and connected it behaves like any other keyboard to the browser. Wireless keyboards can occasionally show lower rollover than their wired counterparts due to the wireless protocol itself.

No. This tool runs entirely in your browser using standard keyboard events. There is nothing to download and no account to create.

On screen software keyboards generally do not fire the same physical key events a hardware keyboard does, so this test is built for a physical keyboard, either built in or connected to your tablet.

If you genuinely held a key down for more than 5 seconds during testing, that will register as a stuck key flag even though nothing is wrong. Release all keys between individual tests to avoid this false flag.

No. Every key press is processed locally in your browser purely to update the visual display and is not sent to a server unless you choose to export a report yourself.