Keyboard Ghosting Test
Test your keyboard for ghosting and rollover. Find out how many keys your keyboard can register simultaneously.
Press and hold multiple keys at once to test how many your keyboard can register simultaneously. Most membrane keyboards support 3–6 key rollover. Mechanical keyboards with N-key rollover should register all keys.
How does this test work?
A keyboard ghosting test checks how many keys your keyboard can register at the same time. Press and hold multiple keys — if some fail to register, your keyboard has ghosting or limited key rollover.
How to use the Keyboard Ghosting Test
Open the Keyboard Ghosting Test on any device with a modern browser — desktop, laptop, tablet, or phone. No downloads, plugins, or signup required. The tool loads instantly and works in Chrome, Firefox, Safari, Edge, and other Chromium-based browsers.
Follow the on-screen instructions to run the test. Results are displayed immediately in your browser. You can repeat the test as many times as needed. For the most accurate results, close other tabs and applications to reduce interference.
Privacy: This test runs entirely in your browser using standard web APIs. No data is collected, uploaded, or stored on any server. Camera, microphone, keyboard, mouse, and controller inputs are processed locally and never leave your device. DeviceKit does not use analytics cookies or tracking scripts.
Browser note: Some hardware values are estimated because browsers limit direct access to device hardware for security and privacy reasons. Results may vary slightly between browsers and operating systems. For the most reliable measurements, use an up-to-date version of Chrome or Edge on a desktop computer.
Frequently Asked Questions
What is keyboard ghosting?+
Ghosting is when your keyboard fails to register certain key combinations pressed simultaneously. It is a hardware limitation of the keyboard's matrix design.
What is N-key rollover?+
N-key rollover (NKRO) means the keyboard can register any number of keys pressed at the same time. Most mechanical keyboards support NKRO, while membrane keyboards typically support 3-6 key rollover.