Description
About Keyboard Ghosting Test
Introduction
Keyboard Ghosting Test shows which keys stay registered when you hold several at once. It surfaces matrix blocking and rollover limits the browser actually receives, including a clear peak simultaneous count.
What this tool does
It tracks keydown and keyup, highlights held keys, and reports the peak number of keys down together in the session. It does not flash firmware or certify electrical NKRO beyond what the OS delivers to the page.
When to use it
Use it for game chords, heavy editor shortcuts, and anti-ghosting claims. Run Keyboard Test first if single keys already fail. Retest after switching Bluetooth versus USB.
How it works
Pressed codes live in an in-memory set. Dropped members of a chord are ghosting or blocking as seen by KeyboardEvent traffic. USB boot protocol, hubs, and wireless modes can cap rollover even when marketing claims NKRO.
Step-by-step instructions
- Click the test surface so focus captures keys.
- Hold a real game or editor chord and watch for dropouts.
- Note the peak simultaneous count shown on the page.
- Retry on another port, cable, or wireless mode if results look odd.
Common problems
Dropped keys in large chords are often real rollover limits. Bluetooth usually underperforms wired USB. Remote desktop can filter dense chords. Sticky Keys can confuse held-state displays.
Privacy explanation
Chord tracking stays in your browser session. Avoid typing passwords while keys are highlighted. No special keyboard permission is requested.