Keyboard rollover & anti-ghosting test
Test how many keys your keyboard can register at the same time. Press multiple keys simultaneously to check for ghosting or dropped inputs.
Press any keys to begin the test
Currently pressed
Your keyboard registered simultaneous keys
If you pressed more keys than this number, the extra keys were not sent to the browser by your keyboard. This is a hardware limitation, not a software one.
Common gaming combo test
Try pressing these common gaming key combinations to see if they register correctly.
How to use this tool
- Start pressing multiple keys at the same time.
- The keyboard above highlights all detected keys in real time.
- Try pressing 3, 4, 5, or more keys simultaneously to find your keyboard's rollover limit.
- Test the gaming combos below to check common key combinations.
- Copy or share your results when you are done.
What your result means
2-key rollover
Basic. Fine for standard typing, but may miss keys during fast gaming or complex shortcuts.
6-key rollover
Good. Handles most typing and gaming scenarios. Standard for mid-range keyboards.
N-key rollover
Full rollover. Every key registers no matter how many are pressed. Common on mechanical keyboards.
Frequently asked questions
What is keyboard rollover?
Keyboard rollover refers to how many keys can be pressed simultaneously and still be correctly registered by the keyboard. "N-key rollover" (NKRO) means every key is registered regardless of how many others are held down.
What is ghosting?
Ghosting happens when a key press is not registered because too many other keys in the same circuit column are already pressed. Anti-ghosting designs route keys to avoid this problem for common combinations.
Why does my browser limit key detection?
Some key combinations trigger browser or OS shortcuts (e.g., Ctrl+W closes a tab). This tool tries to prevent defaults, but certain system-level shortcuts cannot be overridden by a web page.
Is my data stored?
No. This tool runs entirely in your browser. No key presses or test results are sent to any server.
Want to track your keyboard usage over time?
This tool gives you a one-time snapshot. WhatPulse tracks your keystrokes, clicks, and more automatically over time.
Try WhatPulse for freeRelated tools
Keyboard Rollover & Anti-ghosting Test
Test how many keys your keyboard can register simultaneously.
