Tests
Keyboard Ghosting Test
See which keys your browser detects when you hold several at once.
Private by designProcessing happens locally in this browser. Device streams and raw readings are not uploaded.
What this test checks
How to use this test
Start, hold a combination such as W, A, Shift and Space, then release. Compare different combinations.
What the results mean
The count is the number of key-down events still held, with the largest combination saved in technical details.
Troubleshooting
Check the keyboard connection and layout, disable conflicting shortcuts, and compare another browser or USB port.
Browser limitation
Reserved shortcuts, the operating system and browser can hide keys. A missing key does not prove ghosting; this cannot certify N-key rollover. Try another combination or application.