How to Use MCASelector

What is MCASelector?

MCASelector is a third-party utility for Minecraft that lets you view, select, and modify region files (the .mca files) of your Minecraft world. It’s commonly used by server developers to:

Visualize Chunks: See an overview of your world’s chunks.

Delete or Prune Areas: Remove unwanted or corrupted chunks.

Optimize Performance: Clean up your world data to reduce lag or fix issues.

This guide will show you how to use MCA selector to manage your Minecraft world.

How to Install MCASelector

To install MCASelector:

Install MCA selector

Scroll down a bit till you find the download MCA selector link


Once the program is installed, right click it and click on "Run as Administrator" and complete the installation steps

Using MCASelector To Manage Your World

Before trimming or deleting any chunks, create a backup for your Minecraft server to prevent any loss.

Check out our guide on how to backup a Minecraft server for more information.

Trimming Chunks

Click on the File tab and select Open World, and choose the desired world file you want


Choose the chunks you want to delete by holding left click and selecting the chunks


Now click on the Select tab, and click on Delete selected chunks to delete chunks

Deleting Large Parts Of Your World

Choose the chunks you want to keep by holding left click and selecting the chunks


Now click on the Select tab, and click on Invert


Now click on the Select tab, and click on Delete selected chunks to delete chunks


This is an example after deleting all the chunk blocks we've chosen



This will delete all the chunks marked in orange, and the rest will stay as they are. Now you can log into your server and check the applied changes to ensure nothing goes wrong.

Still have some questions?

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By: Ali A.

Updated on: 10/03/2025