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Minecraft Region Fixer

By Alejandro Aguilera (Fenixin)

Locates problems and tries to fix Minecraft worlds (or region files).

Minecraft Region Fixer tries to fix corrupted chunks in region files using old backup copies of the Minecraft world. If you don't have a copy, you can eliminate the corrupted chunks making Minecraft regenerate them.

It also scans the 'level.dat' file and the player '*.dat' and tries to read them. If there are any problems it prints warnings. At the moment it doesn't fix any problem in these files.

Web page:

Mincraft forums posts:

Supported platforms

This program only works with Python 3.x, and DOESN'T work with python 2.x. There was a Windows .exe for older versions, but right now you need to install the python interpreter to run this program.


Older versions of Minecraft had big problems when loading broken worlds. Newer versions of Minecraft are improving the way they deal with corruption and other things.

Region-Fixer still is useful for replacing chunks/regions with a backup, removing entities, or trying to see what's going wrong with your world.


You can read the program help running: "python --help"

For usage examples and more info visit the wiki:

Bugs, suggestions, feedback, questions

Suggestions and bugs should go to the github page:

Feedback and questions should preferably go to these forums posts:

(server administration)

(mapping and modding)

Donations and sponsors

Region-Fixer was created thanks to sponsors and donations. You can find information about that in DONORS.txt




This program has been tested with a lot of worlds, but there may exist bugs, so please, MAKE A BACKUP OF YOUR WORLD BEFORE RUNNING it, I'M NOT RESPONSIBLE OF WHAT HAPPENS TO YOUR WORLD. Other way to say it is USE THIS TOOL AT YOUR OWN RISK.

Think that you are playing with your precious saved games :P .

Good luck! :)


Python script to fix some of the problems of the Minecraft save files (region files, *.mca).







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