Keyboard Test
Press every key and see which ones actually register.
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About the Keyboard Test converter
A keyboard with one dead key is maddening precisely because it is hard to pin down — you notice a letter going missing but not reliably, and by the time you check it works again.
This draws the whole board and lights up each key as it registers. Anything still plain after you have worked across the keyboard is the key that is failing.
Physical keys, not characters
Keys are matched by their position on the board rather than by the character they produce, so the test works the same whether you type in QWERTY, AZERTY, Dvorak or anything else. The labels are what a standard board is printed with; the highlighting follows the key under your finger.
Left and right modifiers are shown separately, because a failing right shift is a real and common fault that a test treating both as one would miss entirely.
Rollover, and why some keys are ignored in games
Hold several keys at once and the counter shows how many the keyboard reports simultaneously. That is its rollover, and cheaper boards run out at around six — or far fewer in particular combinations, which is why a character sometimes refuses to jump while running diagonally.
The limit depends on which keys, not just how many, so it is worth trying the combinations you actually use rather than a random handful.
Keys the layout does not draw
Media keys, a numeric keypad, laptop function keys and the extra buttons on gaming boards are all reported here even though the drawn layout has no place for them. They appear in a separate list with the code the browser saw.
A key producing nothing at all — not even an unknown code — is the one to worry about. That means the press never reached the browser.
Frequently asked questions
Why does pressing Tab not move off the page?
Because the page deliberately intercepts it. Tab, and shortcuts like Ctrl and Alt combinations, would otherwise navigate away instead of being tested — which is the opposite of useful here.
A key lights up but types the wrong character.
That is a layout mismatch rather than a hardware fault. The key is working and the computer is interpreting it under a different keyboard layout — check the language settings rather than the keyboard.
Some keys will not register together.
That is rollover, and it is normal on most keyboards. Membrane boards typically manage six keys at once and struggle with certain combinations. Boards advertising n-key rollover handle any number.
Does this work on a laptop?
Yes. Function-layer keys often report codes the drawn layout does not include, so they appear in the separate list rather than lighting up a key — which still proves they work.
Is anything recorded or sent anywhere?
No. Everything is measured by the page itself and forgotten when you close it. Nothing is uploaded, and no permission is asked for, because none of these tests need one.