How to use the keyboard test
Click anywhere on this page so it has focus, then press every key once. Each key lights up while you hold it and turns blue once your computer has received it. When every key on the diagram is blue, your keyboard is working.
Choose the size that matches your keyboard. Full size includes the number pad, No number pad suits tenkeyless keyboards, and Main keys suits most laptops and compact keyboards. The diagram uses the UK layout, but keys are matched by their position, so it works with any layout setting.
What the colours mean
Grey keys haven't been pressed yet. Blue keys work. Orange keys either registered twice from a single press, or you've told the test they didn't respond.
Key chatter
Chatter is when one press types a letter twice, so "hello" becomes "helllo". The test flags a key when a second press arrives within 35 milliseconds of it being released, which is faster than anyone presses a key on purpose. It's common on worn or dirty mechanical switches.
How many keys at once
"Most keys held at once" shows how many keys your keyboard sent together. Many keyboards stop at six, or block certain combinations. That matters for games that need several keys held together, and for fast typing.
Common questions
Why doesn't the Fn key light up?
The Fn key on most laptops and compact keyboards is handled inside the keyboard itself and never reaches the computer, so no website can detect it. Test it by holding Fn and pressing a key it changes, such as a volume or brightness key.
Why did a key light up but do nothing in other apps?
If a key lights up here, the keyboard and its connection are working. The problem is likely a setting or app: a remapping tool, a game's own key bindings, or the keyboard layout set in your operating system.
Why do some keys open menus instead of lighting up?
A few keys are reserved by the operating system, such as the Windows key, Print Screen or shortcuts like Cmd+Tab. The test still records them when it can. Print Screen on Windows only reports when you let go, so press and release it.
Can I use the page normally while the test is running?
The test captures key presses so keys like Tab and Space don't scroll the page or move between buttons. Click Pause test to use your keyboard normally, and Resume test to carry on.
Is anything I type recorded?
No. The test runs entirely in your browser. Nothing you press is stored or sent anywhere, and closing the page clears it.