Key Rollover Test
Test how many keys your keyboard can register at once (N-key rollover) and catch anti-ghosting gaps before they cost you a match.
Ready to test rollover
Click Start Test, then hold down growing combinations of keys.
Currently Held
0
Max Simultaneous
0
Rollover Rating
—
Currently held keys
None yet
Try these combos once you start
How the Rollover Test works
Start the test, then hold down multiple keys at the same time — start with a simple combo like W + A, then keep adding keys. Every key you're currently holding highlights live on the virtual keyboard, and the counter tracks the largest number of simultaneous keys your keyboard has successfully registered.
If a key you're physically holding down never lights up once you've added enough other keys, that's ghosting— your keyboard's hardware isn't able to report that combination to your computer.
This runs entirely in your browser — nothing about your key combinations is ever recorded or sent anywhere.
FAQ
Key Rollover Test FAQ
Rollover is how many keys a keyboard can register at the exact same time. Cheaper keyboards often support only a handful of simultaneous keys (or specific combinations) before extra presses get dropped — a limitation called "ghosting." Full NKRO keyboards register every key regardless of how many are held.
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