Keyboard Ghosting Test Online
Hold several keys down at the same time. The peak count shows how many keys your board reports simultaneously. Test 6KRO limits, gaming combos (WASD+Shift+Space), and productivity shortcuts.
Keep keys held down. Try W A S D + Shift + Space + Ctrl, then more letters.
What the ghosting test tells you
What it measures
Hold several keys at once and the peak counter shows how many register together. That number is your board's rollover in practice, which often differs from the marketing spec.
What it reveals
If the peak stops around 6, you're hitting a common 6-key limit: fine for typing, but game combos like WASD plus Shift, Space and Ctrl can drop keys. Knowing the limit explains those moments where a press does nothing.
Who should test
Gamers who lose inputs during intense combos, music producers holding MIDI chords, and spreadsheet/CAD power users using multi-modifier shortcuts (Ctrl+Shift+Alt+Key).
How to run a ghosting check
- Hold, don't tapPress several keys and keep them down. Peak only rises while keys stay held together.
- Add more keysTry a game-style stack: W A S D + Shift + Space + Ctrl, then more letter keys.
- Read the peakIf new keys stop registering around 6, you may be at a common 6-key limit. Higher peaks mean better rollover (more keys at once) in this browser.
Ghosting FAQ
Ghosting, 6KRO and NKRO: how many keys your keyboard can really handle at once.
What is keyboard ghosting?
When you press several keys together, some boards drop keys or mis-report them because of how the key matrix is wired. That multi-key failure is what people mean by ghosting or key blocking.
What is NKRO vs 6KRO?
6KRO roughly means about six keys can be held and reported reliably. NKRO (n-key rollover) aims for many more. Marketing claims can differ from what the OS and browser actually deliver.
Is this a perfect hardware test?
No. You only see what the OS sends to the browser. Still useful for spotting multi-key limits in games or comparing keyboards on the same machine.
How do I test key rollover (KRO)?
That's what the peak counter does: hold a first key, add a second without releasing, and keep stacking. The peak is how many keys registered at once. A hard stop around 6 is typical 6KRO; a higher peak means better multi-key reporting.
Why doesn't Fn show up in the ghosting test?
Fn is usually handled in firmware and never reaches the browser, same as on the main keyboard test.