Keyboard Tester

Test every key on your keyboard

This keyboard tester shows a full-size ANSI layout with the function row, navigation cluster, arrow keys and numeric keypad. Click the test area and press keys: each one lights up while held and stays green once it has registered, so you can quickly work through the whole keyboard and see which keys, if any, never respond. It is ideal for checking a new or second-hand keyboard, testing after a spill or cleaning, or confirming that a mechanical switch works reliably.

For every press the tool displays the key value (the character produced), the code (the physical key position), the legacy keyCode and the location, which tells left and right Shift, Ctrl and Alt apart and identifies numeric keypad keys. A running log lists recent key-down and key-up events, including auto-repeat. Keys that are not part of the standard layout, such as ISO or media keys, appear as extra chips below the keyboard.

Check ghosting and key rollover

Hold several keys together — for example W, A, Shift and Space as in a game — and watch the counters. “Held now” shows how many keys the browser currently sees, and “Max simultaneous” keeps the highest number reached. Budget keyboards often manage only two to six keys at once or fail on certain combinations; gaming keyboards with n-key rollover register them all.

Troubleshooting

While the test area is focused, browser shortcuts are blocked so that keys like F5, Tab or Backspace can be tested safely; click anywhere outside the area to use your keyboard normally again. Some keys never reach the browser because the operating system intercepts them, including Fn, many media keys and some Windows-key combinations, while PrintScreen often reports only its release. Nothing you type is stored or sent.