Skip to content
SPECIFICTION
Get listed

Minecraft Region Fixer

github.com

Free plan Open source WindowsmacOSLinuxSelf-hosted
Visit github.com
Spec score 8.4 #4 of 35 in Minecraft World Editors

What it is

Minecraft Region Fixer is a free tool for locating problems in Minecraft worlds and region files, with options to replace or remove corrupted chunks. When an older world backup is available, it can use that copy to replace damaged chunks; without one, it can remove them so Minecraft regenerates them. It also scans level.dat and player .dat files and prints warnings, but does not repair those files. Other documented uses include replacing chunks or regions from backups, removing entities, and investigating world problems. The command-line program runs with Python 3.x, not Python 2.x, and includes options for parallel scanning and saving detailed results to a log file. Its usage guide also describes deletion of broken chunks, broken region files, and excess entities. It supports Minecraft region files (*.mca) and world folders on Windows, Linux, and macOS. The project warns that bugs may exist and recommends backing up a world before use; the tool is used at the user's own risk. It is licensed under GPL-3.0.

Spec sheet

What it does
Minecraft Region Fixer scans Minecraft Anvil worlds and region files for structural and compression problems and attempts recovery.Read 19 Oct 2026 · github.com
Purpose
Locates problems and tries to fix Minecraft worlds or region files.Read 2 Oct 2026 · github.com
Platforms
The usage wiki describes running from source on Windows, Linux, and Mac; Linux and Mac use python regionfixer.py.Read 2 Oct 2026 · github.com
Support
The README directs bug reports and suggestions to GitHub and recommends Minecraft forum posts for feedback and questions.Read 2 Oct 2026 · github.com
License
The repository is marked GPL-3.0 and includes a COPYING.txt license file.Read 19 Oct 2026 · github.com
Backup safety warning
The project warns that bugs may exist, requires users to make a world backup and places use at the user's own risk.Read 19 Oct 2026 · github.com
Batch scanning
The usage guide supports scanning a complete world, individual region files, arbitrary region-file sets and multiple worlds.Read 19 Oct 2026 · github.com
Command line
The README documents running the program with Python, including the command python regionfixer.py --help.Read 2 Oct 2026 · github.com
Command-line interface
The documented primary workflow runs regionfixer.py from a terminal with Python.Read 19 Oct 2026 · github.com
Corrupted chunk recovery
It can replace damaged chunks with copies from an older world backup or delete them so Minecraft regenerates them.Read 19 Oct 2026 · github.com
Corrupted chunks
It can replace corrupted chunks in region files using old backup copies of a Minecraft world.Read 2 Oct 2026 · github.com
Destructive actions
The usage guide documents options to delete broken chunks, broken region files, or entities when a chunk contains too many.Read 2 Oct 2026 · github.com
Detected corruption types
The FAQ lists region-header, chunk-header, corrupted chunk-data, wrong-location, shared-offset and excessive-entity conditions as detectable problems.Read 19 Oct 2026 · github.com
Documentation depth
The project wiki contains installation, usage, FAQ, troubleshooting, typical-symptom and exit-code pages.Read 19 Oct 2026 · github.com
Entity cleanup
It can remove entities from chunks whose entity count exceeds a configured limit.Read 19 Oct 2026 · github.com
Independent derivative
The Minecraft Region Checker documentation says its project was inspired by Minecraft Region Fixer and adds YAML reporting and Docker-oriented operation.Read 19 Oct 2026 · minecraft-world-manager.readthedocs.io
Independent integration
SpigotMC documents wiring Region Fixer into Multicraft's Chunkster button through a server configuration file.Read 19 Oct 2026 · spigotmc.org
Limit: command-line learning curve
A Minecraft Forum user reported spending hours confused by how to invoke the Python program, illustrating the terminal-oriented workflow's accessibility barrier.Read 19 Oct 2026 · minecraftforum.net
Limit: false lead in server troubleshooting
A Reddit administrator reported that Multiverse recommended Region Fixer for a world-load error, but the scan found no world problems, so the underlying issue remained.Read 19 Oct 2026 · reddit.com
Limit: long scans
SpigotMC warns that scans of large worlds can take considerable time and may appear frozen while processing.Read 19 Oct 2026 · spigotmc.org
Limit: shallow content validation
The Minecraft Forum author explains that the tool checks region structure and compression rather than deeply validating every block or mod-specific value inside a chunk.Read 19 Oct 2026 · minecraftforum.net
Linux installation
Linux instructions recommend obtaining the source with Git and running it with the installed Python interpreter.Read 19 Oct 2026 · github.com
Logging
The --log option writes detailed scan results to a file.Read 19 Oct 2026 · github.com
macOS installation
macOS instructions call for Python and wxPython when using the GUI and otherwise follow the Linux approach.Read 19 Oct 2026 · github.com
Maintainer identity
The README credits Alejandro Aguilera under the Fenixin name as creator.Read 19 Oct 2026 · github.com
Maintainer location
The Fenixin GitHub profile lists Spain as the user's location.Read 19 Oct 2026 · github.com
Minecraft edition scope
The FAQ describes the tool as focused on Anvil region-file integrity and says it generally does not remove mod-added blocks or entities.Read 19 Oct 2026 · github.com
Other uses
The project says it can replace chunks or regions with a backup, remove entities, and help investigate world problems.Read 2 Oct 2026 · github.com
Parallel processing
The command line has a --processes or -p option to increase scan parallelism.Read 19 Oct 2026 · github.com
Parallel scanning
The command line supports a --processes or -p option to set the number of processes used for scanning.Read 2 Oct 2026 · github.com
Praise: automation options
SpigotMC documents deletion, backup replacement, entity cleanup and interactive command-line flags for server administration.Read 19 Oct 2026 · spigotmc.org
Praise: backup replacement
A Minecraft Forum discussion highlights that damaged chunks can be substituted from a backup or removed when no backup exists.Read 19 Oct 2026 · minecraftforum.net
Praise: server recovery
SpigotMC describes Region Fixer as a go-to tool for chunk corruption and excessive-entity problems on Minecraft servers.Read 19 Oct 2026 · spigotmc.org
Public API or SDK
The published documentation exposes command-line scripts and Python source modules but does not describe a hosted API or SDK.Read 19 Oct 2026 · github.com
Python compatibility
The README states that the current program supports Python 3.x and not Python 2.x.Read 19 Oct 2026 · github.com
Python requirement
The program requires Python 3.x and does not work with Python 2.x.Read 2 Oct 2026 · github.com
Release status
The latest GitHub release shown is v0.3.6, which changed option generation and switched UTF-8 decoding to the mutf-8 library.Read 19 Oct 2026 · github.com
Repository activity
The repository page shows 622 stars, 116 forks, 13 issues and one pull request.Read 19 Oct 2026 · github.com
Safety warning
The project warns that bugs may exist and recommends backing up a world before running the tool, which it says is used at the user's own risk.Read 2 Oct 2026 · github.com
Security policy
GitHub reports that the repository has no SECURITY.md policy and no published security advisories.Read 19 Oct 2026 · github.com
Self-hosting
The tool runs locally against world directories or region files, so server administrators can operate it on their own machines.Read 19 Oct 2026 · spigotmc.org
Support channel
The README directs bug reports and suggestions to GitHub and points users to Minecraft Forum threads for questions and feedback.Read 19 Oct 2026 · github.com
Windows executable status
The FAQ says the Windows executable is no longer maintained and old downloadable executables should not be used.Read 19 Oct 2026 · github.com
Windows installation
Windows source-code use requires installing Python 3.x, downloading the repository archive and running the script from a command prompt.Read 19 Oct 2026 · github.com
Without backups
Without a backup, it can eliminate corrupted chunks so Minecraft regenerates them.Read 2 Oct 2026 · github.com
World file scanning
It scans level.dat and player .dat files and prints warnings when it encounters problems, but does not fix those files.Read 2 Oct 2026 · github.com
World-data scanning
The program reads level.dat and player .dat files and reports warnings, but does not repair those files.Read 19 Oct 2026 · github.com

Plans and prices

Minecraft Region Fixer Free GPL-3.0 licensed · requires Python 3.x Read 2 Oct 2026 · github.com
Source code Free GPL-3.0 code · Python 3.x required · local command-line use Read 19 Oct 2026 · github.com

Every Minecraft Region Fixer plan and price →

Strong points and limits

Strong points

  • Can replace corrupted chunks from an older backup
  • Can remove chunks for Minecraft to regenerate
  • Scans level.dat and player .dat files
  • Supports Windows, Linux, and macOS
  • Can log results and scan in parallel

Limits

  • Requires Python 3.x
  • Does not repair level.dat or player .dat files
  • Deletion options can alter worlds
  • Project warns bugs may exist

Who it suits

It suits Minecraft players or administrators who need to inspect or repair region files and world folders, especially when backups are available. Users should be comfortable with Python and command-line options.

Verdict

Minecraft Region Fixer offers several ways to address region and chunk problems, including replacement from backups or removal for regeneration. Back up the world first, and note that its scans of level.dat and player .dat files only report warnings.

Where Specifiction places it

Alternatives to Minecraft Region FixerAll alternatives →