How to test a keyboard: complete step-by-step guide
Before declaring a keyboard defective — or buying a new one you don't actually need — run a quick diagnosis in your browser. This guide shows how to test a physical keyboard in a few minutes using theonline keyboard test, covering ANSI/US and ABNT2 layouts, anti-ghosting mode and how to interpret the results.
Before you start
Plug the keyboard in via USB or pair it via Bluetooth, then open theABNT2 keyboard test page in your browser. There is nothing to install. Place the cursor over the virtual keyboard shown on screen: the page needs to have focus for the browser to receive key events. The Fullscreen button makes the layout easier to read on small screens.
Step by step
- Pick the right layout. Use ABNT2 for Brazilian keyboards and ANSI/US for American keyboards.
- Press each key once. Walk row by row, from Esc to the numpad.
- Watch the visual feedback. The key should light up blue when pressed and stay marked as tested when released.
- Note any key that fails. If a key doesn't light up, the browser isn't receiving it.
- Enable anti-ghosting mode. Try combinations like
Shift + A + Sto check the rollover limit. - Review the history panel. It shows stuck keys, rapid repeats and timing between keypresses.
What to do if a key fails
If a key doesn't light up, repeat the test on another computer or another operating system. If it works elsewhere, the issue is likely a driver or local configuration. If it fails everywhere, it's almost certainly a hardware problem. Stuck keys usually point to debris or oxidised contacts, while rapid repeats usually mean a worn switch. The test only confirms the failure — repair requires proper cleaning or component replacement.
When to use a different tool
The anti-ghosting test in the browser is enough for most cases. For professional diagnostics, native operating-system tools or manufacturer utilities can provide deeper readings. For the average user, however, the online test covers the common scenarios — dead keys, stuck keys and ghosting combinations.
Frequently asked questions
How long does it take to test every key?
With a little practice, a full ANSI/US keyboard test takes three to five minutes. Take your time: the goal is to press each key at least once, not to rush.
Can I test more than one keyboard in the same session?
Yes. Disconnect the current keyboard, plug in the next one and click Reset. The history and progress are cleared on every swap to avoid confusion.
Does it work with wireless keyboards?
It does, as long as the operating system has already recognised the device. If the keyboard works in other applications, the tester page will receive it as well.