Deleting Unused Chunks On Your World

What is MCA Selector?

MCA Selector is an external tool to export or delete selected chunks and regions from a world save of Minecraft Java Edition.

It can help with deleting chunks that have been loaded for a very little amount of time. These chunks are usually generated by travelling players and are unmodified, and they can take up a lot of disk space without being actively used by players.

Deleting these chunks can:

• Significantly reduce your world size
• If done correctly, also preserve all important and actively used areas

Downloading Your World:

1. Download your world folder by following our World Management guide.

2. Extract your world from the archive file.

Downloading and Installing MCA Selector:

1. Go to the GitHub releases page of MCA Selector.

2. Scroll down to the Assets section.

3. If you are on Windows, download the MCA_Selector_Setup.exe file. Otherwise, download the mcaselector-VERSION.jar file.

4. Run the file to complete installation.

Windows may flag the file as “untrusted” because it isn’t digitally signed by a verified developer. To continue, click “More info” and then select “Run anyway”.

Editing Your World:

1. In the action bar, open “File” and select “Open world”.

2. Pick the world you would like to edit.

3. Open “Tools” and select “Filter chunks”.

4. Change the default InhabitedTime parameter to “1 minute”.

   Setting this over 1 minute can be destructive for a small gain in disk space and should only be selected if you know what you are doing.

5. Press “OK” and wait for the selection to complete.

6. Verify that you haven’t selected any important chunks.

7. If needed, you can select or deselect chunks manually. You might need to zoom in to edit individual chunks.

   Keybind	Description
   Arrows/WASD	Move camera
   Right-Click	Deselect chunk
   Left-Click	Select chunk
   Scroll	Zoom in/out

8. In the action bar, open “Selection” and select “Delete selected chunks”.

Uploading Your World:

Upload your world folder by following our World Management guide.

Make sure you empty the recycle bin after deleting the old world to regain used disk space.