keyboard test · key tester · test keyboard online
Keyboard Tester
Check every key on your keyboard right in the browser: stuck keys, dead switches and how many keys register at once. Nothing to install.
Press any key
Each key lights up while it is held and stays green once it has worked. Hold several keys together to see how many your keyboard can report at once.
Event log
Key events will appear here as you type.
Common questions
Why does a key not light up?
Some keys never reach the browser: Fn, media keys and certain Windows shortcuts are handled by the keyboard or the system first. If an ordinary letter or number stays grey, the switch or the keyboard itself is at fault, not the page.
How do I check ghosting and key rollover?
Hold several keys at the same time, for example W, A, S, D and Space. The Most at once counter shows how many keys the keyboard reported together. If a key stays grey while others are held, that combination is blocked — typical for office keyboards, rare for gaming ones with N-key rollover.
Is anything sent to a server?
No. The test runs entirely in this tab. What you type is never uploaded or stored anywhere.