Key Rollover Test: An Essential Guide

Key Rollover Test

Press and hold keys to see the results.

Number of pressed keys: 0
List of recognized keys:

In the world of computing, the term “key rollover” might not be as familiar as others.

However, it plays a crucial role in ensuring the smooth functioning of our keyboards.

This article aims to demystify the concept of a key rollover, its importance, and how to perform a key rollover test.

About tool:

A Key Rollover Test evaluates a keyboard’s ability to recognize multiple key presses simultaneously. It’s crucial for ensuring responsive and accurate keyboard performance.

Key Rollover Test: An Essential Guide

What is Key Rollover?

Key rollover refers to a keyboard’s ability to register multiple keys being pressed simultaneously correctly.

This feature is particularly important for fast typists, gamers, and professionals who rely on keyboard shortcuts.

The Importance of Key Rollover

The key rollover feature ensures that every keystroke is accurately registered, even when multiple keys are pressed at the same time.

Without it, some keystrokes may go unnoticed, leading to typing errors or missed actions.

Types of Key Rollover

2-Key Rollover (2KRO)

In a 2KRO keyboard, any two keys can be pressed simultaneously and still be registered correctly.

However, if a third key is pressed, it may not be recognized.

N-Key Rollover (NKRO)

NKRO keyboards can handle unlimited simultaneous key presses without any of them being “lost” or unregistered.

These keyboards are often preferred by gamers and fast typists.

How to Perform a Key Rollover Test

Performing a key rollover test is a straightforward process. Here are the steps:

  1. Open a text editor: You can use any text editor, like Notepad or Word.
  2. Press multiple keys: Start pressing and holding multiple keys simultaneously.
  3. Check the input: See if all the keys you pressed are registered in the text editor.

Your keyboard has passed the key rollover test if all the keys are correctly registered.


Ques 1: Why is key rollover important for gamers?

Ans: Gamers often need to press multiple keys simultaneously for various in-game actions. A keyboard with good key rollover ensures all these simultaneous key presses are registered correctly, enhancing the gaming experience.

Ques 2: Can a keyboard have more than N-Key Rollover?

Ans: N-Key Rollover is the highest form of key rollover where ‘N’ represents unlimited keys. Therefore, a keyboard cannot have more than N-Key Rollover.

Ques 3: How can I improve my keyboard’s key rollover?

Ans: Key rollover is a hardware feature and cannot be improved through software updates. If you require a keyboard with a higher key rollover, consider purchasing a keyboard specifically designed with higher KRO or NKRO.


Understanding key rollover and how to test it is essential for anyone who relies heavily on their keyboard.

Whether you’re a gamer, a fast typist, or a professional using complex keyboard shortcuts, a keyboard with good key rollover can significantly improve your efficiency and accuracy.