Keyboard NKRO & Anti-Ghosting Test
Test your keyboard's N-Key Rollover capability by pressing multiple keys simultaneously. NKRO determines how many keys your keyboard can register at once — critical for gaming and fast typing.
Browser PrecisionMedium
Browser event timing. Hardware-level rollover may differ from browser-reported values.
Frequently Asked Questions
What is NKRO?
NKRO (N-Key Rollover) means the keyboard can register all keys pressed simultaneously. Most mechanical keyboards support NKRO, while membrane keyboards are often limited to 6KRO or less.
What is anti-ghosting?
Anti-ghosting prevents phantom key presses that occur when certain key combinations are pressed on keyboards without full rollover support. Keyboards with anti-ghosting ensure every intended keypress is registered.
How many keys do I need for gaming?
Most games require at least 6KRO for WASD + action keys. Competitive gaming benefits from full NKRO to ensure no keypresses are missed during complex inputs.
Why does my keyboard miss keys when pressing many at once?
This is a rollover limitation. Budget keyboards typically support only 2-6 simultaneous keys. When you exceed this limit, additional keys are ignored or ghost keys appear.