On page 9 sections
Briefly
Cleaning chunks and reducing world files
Stop the server or leave the world and open a copy of it to MCA Selector. Select unnecessary cups, manually delete constructions, delete the selected and check the result in the game. The tool is designed for Java worlds.
- Close the world or stop the server to prevent the game from writing files while editing.
- Copy the entire world folder to a separate location and work with the copy.
- Download MCA Selector from the author's repository. Check the world version support; the current README lists Java up to 26.3+.
- Open the folder with the desired region files. World dimensions can be stored separately.
On a large scale, entire regions are identified; when approaching - separate chunks.
- Select unused areas with the mouse or filter.
- Check boundaries near houses, roads, farms and portals.
- Deselect all desired areas and save the selection as a separate file.
The filter takes into account the game time spent by the players in the cup. It helps to find low-use areas, but does not determine the value of building.
| Situation | What to do |
|---|---|
| Quickly built object | He may have short visiting hours. Exclude it manually. |
| Long loaded empty area | A great time does not mean an important building. |
| Coordinates | xPos and zPos refer to chunks. Do not substitute block coordinates without recalculation. |
First, apply a filter to the selection and view the map; Don't start with immediate conditional removal.
- Make sure that the areas you don't need are selected.
- Use deletion of selected chunks.
- If necessary, defragment region files: it frees up empty sectors while preserving the remaining data.
- Open the edited copy in the game. Check the buildings and transitions between the saved and new areas.
| Situation | What to do |
|---|---|
| Revisited the remote area | The game will create the chunks again. Their appearance depends on the generator and version with which the world is opened. |
| The seed or generator has changed | New chunks may differ sharply from neighboring ones. |
| The size has hardly decreased | Check other dimensions, adjacent entity files, and the exact size of the exact edited copy. |
- MCA Selector: purpose and versions - author of the project
- Allocation, deletion and defragmentation
- Chunk and InhabitedTime filters
The instructions are checked on October 31, 2026. Select files to fit your game and device.
Is MCA Selector suitable for Bedrock?
No. Its main format is Java region files. Bedrock keeps the world different.
Will the house be deleted along with the selected chunk?
Yes. Deletion affects the contents of the selected chunk. Save the areas you need and edit a separate copy.
What does defragmentation do?
Overwrites region files without empty sectors. Unlike chunk removal, it is not intended to remove existing terrain.
Reconciled with authors ' documentation and official statement 2026-10-31.