Press every key on your keyboard — each one turns green as soon as it registers. Works with any built-in, USB or Bluetooth keyboard.
0 of 87 keys tested
Press keys and this tool shows exactly what the browser receives: which physical key fired, the character it produced and the precise timing. Nothing is installed, and nothing you type leaves your device.
Every key you press lights up on the on-screen keyboard and stays green, so the keys you have not checked yet are always obvious. Keys are matched by their physical position, which means the test works the same no matter which keyboard language your system is set to. If a key stays grey after a firm press, it is not reaching the computer at all.
Rollover is how many keys your keyboard can report at the same time. Hold down several keys together and the counter shows the maximum reached. Basic membrane keyboards typically block after 3 to 6 keys, gaming keyboards advertise 6-key rollover over USB, and NKRO boards register every key you can physically hold. Low rollover is why some in-game key combinations silently fail.
A worn switch can send two presses when you tap it once — the effect known as chatter or key bounce, and the reason letters sometimes double themselves while you type. The test flags any key that fires twice within 45 milliseconds, which is faster than a human can press, and shows how long each press lasted so a sticking key is easy to spot.
Hold one key down and the tool measures the two values your operating system uses for auto-repeat: the delay before repeating starts and how many characters per second follow. Both are system settings rather than hardware limits, so this is a quick way to check your typing configuration on Windows, macOS or Linux.
Switch between the ANSI layout used in the US, the ISO layout common in Europe with its tall Enter key and extra key next to the left Shift, and the Japanese JIS layout with its conversion and kana keys. You can also pick a size — full size, TKL, 75%, 65% or 60% — so the progress counter only asks for the keys your keyboard actually has. Where the browser allows it, the keys are labelled with the legends your operating system actually uses, so an AZERTY, QWERTZ or ЙЦУКЕН layout shows its own characters.
Run through every key in under a minute before handing over the money. Dead keys and chattering switches are the two most common faults on second-hand boards.
Coffee, dust and cleaning liquid all cause the same symptoms. Test each key after it dries to see which ones came back and which need the switch replaced.
Check that the movement, sprint and ability keys you use together all register at once. If the rollover counter stops at three, your keyboard is the reason a combo does not fire.
Verify each switch right after soldering or hot-swapping it, and confirm that a repaired key no longer chatters before you close the case.
Make sure the keys you depend on — Tab, Enter, arrows and modifiers — work before it matters, especially on a rented, shared or unfamiliar machine.
Factory faults happen. Check every key, the rollover and the layout on the first day, while returning the keyboard is still simple.