Keyboard Tester

A keyboard tester lets you press every key on your keyboard and watch, in real time, whether the browser actually registers it. That sounds simple, but it catches problems that are easy to miss during normal typing: a key that only responds some of the time, a key that has stopped responding entirely, or a key that gets stuck down after a spill and keeps firing long after you've let go.

This kind of check is useful in a few common situations. If you've just spilled a drink near your keyboard, testing every key immediately tells you exactly which ones were affected rather than discovering it days later mid-sentence. If you're buying a used mechanical keyboard, running through every key confirms all the switches actually work before you rely on it. If a laptop key feels different than the others, a stuck or dead key test can confirm whether it's a real hardware issue or just your imagination. And if you're troubleshooting a gaming keyboard for input problems, this tells you whether the issue is your hardware or something else entirely.

Press any key and its outline on the visual keyboard below will light up immediately, then fade back to a marked "tested" state the moment you release it, so you can see your progress at a glance instead of losing track of which keys you've already covered. If a key stays highlighted for several seconds without you holding it down, KeysInFlow flags it as a possible stuck key. The layout below includes the full alphanumeric block, function row, arrow keys, and numpad, with Windows and Mac modifier labels applied automatically based on your device.