Find the dead key before you blame the software: press any key and see it light up, check
the exact key and code values developers need when debugging
keyboard shortcuts, and measure how many simultaneous presses your board really registers.
Handy after a spill, before buying a used mechanical keyboard, or when a game insists your
keyboard is ghosting.
Keystrokes are processed entirely in your browser and never transmitted. More device checks: the mic test and webcam test cover your call setup, and the stopwatch is there if you are timing your typing drills.
Frequently asked questions
How do I test if a key on my keyboard works?
Just press it. Working keys light up on the on-screen keyboard and appear in the event log with their key value and physical code. A key that produces no log entry at all is not reaching the operating system — try another USB port, clean under the keycap, or test the keyboard on another machine.
What is key rollover and ghosting?
Rollover is how many keys your keyboard can register simultaneously — "NKRO" means all of them, cheaper boards often manage 6 or fewer. Ghosting is the related failure where pressing certain key combinations produces a phantom fourth keypress or drops one. Hold down as many keys as you can and watch the max rollover counter to measure yours.
Why don't some keys register in the test?
The browser and OS reserve certain keys and combinations — the Windows/Cmd key alone, media keys, Fn (which never reaches software), and shortcuts like Cmd+Tab or Alt+F4 are intercepted before a web page sees them. That is a platform limitation, not a broken key: test those in a native app if in doubt. Tab, Space, and the arrow keys do reach the page, but they also move focus and scroll — click the on-screen board first to capture them for the test instead.
Are my keystrokes recorded or sent anywhere?
No. Key events are handled entirely inside your browser to light up the display and the log — nothing is transmitted, stored, or analyzed on any server. Still, standard advice for any keyboard tester: type test sequences, not your passwords.
My laptop keyboard has no numpad or F-row on the diagram — can I still test those keys?
Yes. The visual board shows a compact 60% layout, but every key you press — F-keys, numpad, arrows, Home/End — appears in the event log with its exact code, so you can verify any key on any keyboard, from a 60% board to a full-size one with a numpad.