Press every key once: each one should light up on the layout below as your computer registers it. A key that never lights is dead, and one that only lights with a hard press is worn. For rollover, hold several keys at once, such as W, A, S, D and Shift, and count how many register.
Standard USB keyboards often report up to 6 keys plus modifiers at once, and some membrane boards drop keys sooner; gaming boards advertise N-key rollover (NKRO). Everything runs in your browser. Updated 2026.
This keyboard test er helps you verify that every key on your keyboard is working correctly. It's especially useful when buying a used keyboard or testing a new mechanical keyboard.
Keys that don't register at all. Common causes:
Keys that register multiple times with one press. Solutions:
Keys that stay registered after release. Try:
Individual switches for each key
Rubber dome or scissor switches
Often with anti-ghosting features
Low-profile integrated keyboards
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Click into the page and press each key in turn. The key lights up on the on-screen layout and the Last Key and Key Code fields update when your computer receives it. Any key that never lights is not registering.
Hold down several keys together, for example W, A, S, D and Shift, and see how many stay lit. If a key stops registering once you pass a certain number, that is your rollover limit. N-key rollover (NKRO) boards register every key at once.
Chatter is a single press registering as two or more presses, usually from a worn or dirty mechanical switch. To check for it, open a plain text editor and press the suspect key slowly once: a chattering switch types the character twice. This tester shows whether each key registers at all, and the Keys Pressed count tracks how many different keys have worked so far.
Yes. It works with any keyboard your browser can read, including laptop, wireless and mechanical keyboards. Some function and media keys are handled by the operating system and may not reach the browser.