Answer: Press keys above — each one lights up with its code and location, letting you find dead keys instantly.
Press any key — it lights up green when it registers
On phones and tablets there is no physical keyboard to test — open this page on a laptop or desktop. Modifier rows map both left and right keys.
🔒 Key presses are detected locally in your browser. Nothing is typed, recorded or uploaded.
Press any key and it lights up on the on-screen layout along with its event code and location, so dead or intermittent keys are immediately obvious. Everything runs locally in the browser with nothing to install. It works for laptops, external mechanical keyboards, and anything else your operating system recognizes.
All of them: letters, numbers, modifiers (Shift, Ctrl, Alt, OS keys), the function row, and punctuation. You can also hold several keys at once to probe rollover behavior on gaming keyboards. Keys that fail to light up consistently are the ones to investigate.
Not necessarily. First rule out software: test in a different browser or app, and disable key-remapping utilities (AutoHotkey, vendor software, or keyboard modes like Mac/Windows swapping) that can swallow events. If the key stays dead everywhere, the switch or membrane is likely faulty.
Yes — laptop keyboards report key events the same way external ones do, so the test is identical. Because laptop keys are harder to replace, confirm the failure in a second browser and after a reboot before concluding it is hardware. Sticky or double-firing keys usually point to a physical switch problem.
This tool listens to keydown events in your browser and highlights the matching key on a visual QWERTY layout. A key that lights up every time you press it is electrically healthy; a key that never lights up is likely dead, and one that flickers or double-fires may have a worn switch. The counter tracks how many unique keys you have verified, and repeated presses of an already-tested key get a softer highlight so you can spot chatter (unwanted repeated signals).
While the test is active, keys like Tab, Escape, Space and arrow keys are intercepted so the page does not move focus or scroll away — your keystrokes stay in the test area. Nothing you type is stored or transmitted; the page only reads key codes, never text fields.
Work across each row left to right, then test both Shift keys, both Ctrl keys, Alt, Enter, Backspace and the space bar — these are the most-used keys and the most likely to wear out first. If a key only fails sometimes, press it 20–30 times in a row; intermittent faults show up quickly under repetition. For laptop keyboards, a dead key after a spill is often residue under the keycap rather than a broken switch, and may be fixable with careful cleaning.