InputAnalyzer
Keyboard

Keyboard ghosting test

Hold guided combinations and compare the keys you physically press with the keydown events the browser receives.

Processed locallyNo installationGuided test

How this test stays free. At the end, you can watch a short ad to unlock the report. If no ad is available, the result opens automatically. Premium skips this step.

Local in-browser diagnosis

Ghosting and rollover test

Repeat one guided chord three times to look for missing or unexpected keys.

Select start. Capture stays inside the keyboard test area.
Combination to test
Last eventNo event received
Active0
Confirmed0
Repeats0
Maximum simultaneous0

Attempt 1 of 3

Hold only the selected combination briefly, then press F10 to confirm (or use the button).

With the area focused, press F10 to confirm each attempt. F10 is reserved and is not included in measurements. Browser and system shortcuts are not blocked and may interrupt an attempt.

Key codes are analysed only in this browser and are never sent to analytics.

What this test checks

Check which simultaneous key combinations reach the browser and explore possible keyboard ghosting or rollover limits.

InputAnalyzer processes test events locally and does not upload your raw inputs or result values.

How to run the test

01

Focus the test

Start the test and keep the page focused. Choose combinations that do not invoke system shortcuts.

02

Build a combination

Hold the displayed keys one at a time without releasing the earlier keys.

03

Confirm and repeat

Compare the held keys shown on screen with your physical combination, then try different areas of the keyboard.

How to read the result

Observed signals, not artificial certainty.

All held keys detected

That specific combination reached the browser; it does not guarantee the same result for every key pattern.

Key missing from a combination

A repeatable omission may indicate a matrix or rollover limit, provided focus and reserved shortcuts are ruled out.

What this test cannot prove

What the browser cannot see

  • Ghosting is combination-specific, so one successful pattern cannot establish full n-key rollover.
  • Operating-system shortcuts, accessibility features and focus loss can suppress events before the page receives them.
  • Results are browser-based estimates, not a physical hardware diagnosis.

Useful next tests

Keyboard test

Use a focused test area to confirm which physical key positions and values the browser receives without recording typed text.

Frequently asked questions

Short answers before you test again

What is keyboard ghosting?

Ghosting commonly describes a key in a multi-key combination being missed or, on older designs, an extra key being reported.

Does six detected keys mean 6-key rollover?

It confirms only the combination you tried. A keyboard can handle one six-key pattern and fail another because its matrix paths differ.