Output
Held keys; transitions; repeat intervals
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Keyboard Ghosting Test
Check simultaneous key combinations for missing inputs.
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Keyboard Ghosting Test · At a glance
Quick answer: Check simultaneous key combinations for missing inputs. Every held key should remain visible until release.
Keyboard Ghosting Test
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Hold W, A and Shift, then add Space or another action key.
- Repeat the combinations that matter for your own game or workflow.
Input
Focused physical key presses
Browser requirement
KeyboardEvent.code; keydown and keyup
Processing
Runs on your device; no tool-result upload
How it works and what the result means
The tester records browser key-down and key-up events, tracks held keys, and separates operating-system repeats from fresh presses. Short intervals are clues to investigate, not proof of a defective switch.
Reading the result
Every held key should remain visible until release. The largest simultaneous count describes the combinations you actually tried.
Test the combinations you actually use
Hold W, A and Shift, then add Space or an action key. Check that every key appears and stays held until release. A missing event can result from a reserved shortcut, keyboard matrix limitation or operating-system handling. The maximum simultaneous count records what reached this page, not a universal NKRO certificate.
What to check next
Reserved shortcuts and focus changes can hide events. Test a different combination and application before assuming a keyboard matrix limitation.
System shortcuts and some special keys are intercepted before a web page receives them. USB polling frequency, analog actuation distance and physical rapid-trigger settings cannot be read from keyboard events.
Frequently asked questions
Does passing one combination prove full NKRO?
No. It confirms delivery of that combination in this environment. A rollover claim requires broader testing across relevant key combinations.
How do I start the Keyboard Ghosting Test?
Click the test area to focus it, then press and release the keys you want to inspect. Try simultaneous combinations for a ghosting check.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Why can two attempts give different results?
Power settings, background tasks, browser scheduling, operating-system input processing and device settings affect measurements. Compare repeated attempts with identical settings rather than the single highest score.