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
  • Maximum Record Tracking: Automatically records your highest simultaneous key press count
  • Currently Pressed Keys Display: Visual badges showing all keys being pressed in real-time
  • Record History: Maintains a log of the last 10 record-breaking multi-key press combinations
  • Timestamp Tracking: Each record entry includes the exact time it was achieved
  • Visual Key Highlighting: Pressed keys are highlighted on the keyboard layout for easy visualization
  • Reset Functionality: Clear statistics and start fresh testing at any time
  • Key Name Formatting: Displays clean, readable key names without technical prefixes
  • Interactive Keyboard: Click keys on-screen or use your physical keyboard for testing
  • Responsive Layout: Statistics cards adapt to different screen sizes for optimal viewing
  • Browser-based: No installation required - works directly in your web browser
  • Cross-platform: Test any keyboard on Windows, Mac, or Linux systems

Use Cases

  • Keyboard Purchase Verification: Verify advertised n-key rollover specifications before or after buying
  • Gaming Keyboard Testing: Ensure your gaming keyboard can handle complex key combinations
  • Mechanical Keyboard Comparison: Compare rollover capabilities between different keyboards
  • Troubleshooting: Diagnose keyboard issues where certain key combinations don't work
  • Typing Test: Test if your keyboard supports the key combinations you need for work
  • Quality Assurance: Test keyboards in a production or retail environment
  • Hardware Development: Validate keyboard firmware and driver implementations
  • Gaming Setup Optimization: Ensure your keyboard meets requirements for competitive gaming
  • Keyboard Research: Study and document keyboard behavior and limitations
  • Educational Tool: Demonstrate n-key rollover concepts in computer hardware classes
  • Stream Setup Testing: Verify keyboard performance before purchasing for streaming setup
  • Professional Workflow: Ensure keyboard supports complex shortcut combinations for creative software
  • Accessibility Testing: Verify keyboard works correctly with assistive technology requiring multiple keys
  • Technical Support: Help customers diagnose keyboard issues remotely
  • Product Reviews: Generate accurate specifications when reviewing keyboards online