What is n-key rollover?

N-key rollover (NKRO) is a keyboard's ability to register multiple simultaneous key presses accurately. In a keyboard with full n-key rollover, you can press any number of keys at once and the computer will register every single press correctly. This is crucial for gaming, fast typing, and keyboard shortcuts that require multiple modifier keys. Many standard keyboards have limited rollover (often 2-6 keys), which can cause "ghosting" - where some key presses aren't registered when too many keys are held down simultaneously.

Tool description

The Keyboard Multi Key Press Test is a diagnostic tool designed to test and measure your keyboard's n-key rollover capability. This tool displays a visual keyboard layout and tracks exactly how many keys your keyboard can register at the same time. As you press multiple keys simultaneously, the tool counts and records your maximum simultaneous key presses, helping you understand your keyboard's true capabilities and limitations.

The tool provides real-time statistics showing currently pressed keys, your maximum record, and a detailed history of all your multi-key press attempts. Whether you're testing a new keyboard, diagnosing issues, or simply curious about your keyboard's capabilities, this tool gives you precise, visual feedback about your keyboard's performance.

Features

  • Real-time Key Press Detection: Instantly detects and displays all pressed keys with visual feedback
  • Full QWERTY ANSI Layout: Complete keyboard visualization including numpad, function keys, and arrow keys
  • Simultaneous Key Counter: Shows exactly how many keys are currently pressed at any moment