Minecraft Region Fixer
Minecraft Region Fixer is a free utility for finding problems in Minecraft region files and world folders on Linux, macOS, and Windows.
What Minecraft Region Fixer is
Minecraft Region Fixer is a free utility for finding problems in Minecraft region files and world folders on Linux, macOS, and Windows. It can replace corrupted chunks with chunks from an older backup, or remove them so Minecraft can generate replacements when no backup is available. It also scans level.dat and player .dat files and reports warnings, but does not repair those files. Other uses include replacing regions from backups, removing entities, and investigating world problems. The command-line program runs with Python 3.x; it does not work with Python 2.x. Options let users set the number of scanning processes, write detailed results to a log, and delete broken chunks, region files, or excess entities. Those deletion options can alter a world, and the project warns that bugs may exist and recommends making a backup before use. It supports Minecraft region files (.mca) and world folders, and is licensed under GPL-3.0.
Good
- Can restore corrupted chunks from an older backup
- Can remove chunks for Minecraft to regenerate
- Scans level.dat and player .dat files
- Supports parallel scanning and detailed logs
Watch out
- Requires Python 3.x
- Does not fix level.dat or player .dat files
- Deletion options can remove chunks or region files
- Project warns bugs may exist and advises backups
Who it suits
It suits Minecraft players who want to inspect or repair region files and are comfortable running a Python command-line program. Users who need to recover files should have a backup where possible.
Verdict
Minecraft Region Fixer offers several ways to investigate and address damaged world data, including recovery from a backup. Its command-line workflow, Python requirement, and destructive options make it important to back up a world before use.
Plans and prices
From Minecraft Region Fixer's own pricing page, checked 2 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Minecraft Region Fixer | Free | GPL-3.0 licensed · requires Python 3.x |
| Source code | Free | GPL-3.0 code · Python 3.x required · local command-line use |
The facts
Each one read from Minecraft Region Fixer's own pages, with the date it was checked.
What it does
- 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.checked 19 Oct 2026
- Batch scanning
- The usage guide supports scanning a complete world, individual region files, arbitrary region-file sets and multiple worlds.checked 19 Oct 2026
- Command line
- The README documents running the program with Python, including the command python regionfixer.py --help.checked 2 Oct 2026
- Command-line interface
- The documented primary workflow runs regionfixer.py from a terminal with Python.checked 19 Oct 2026
- Corrupted chunk recovery
- It can replace damaged chunks with copies from an older world backup or delete them so Minecraft regenerates them.checked 19 Oct 2026
- Corrupted chunks
- It can replace corrupted chunks in region files using old backup copies of a Minecraft world.checked 2 Oct 2026
- Destructive actions
- The usage guide documents options to delete broken chunks, broken region files, or entities when a chunk contains too many.checked 2 Oct 2026
- Detected corruption types
- The FAQ lists region-header, chunk-header, corrupted chunk-data, wrong-location, shared-offset and excessive-entity conditions as detectable problems.checked 19 Oct 2026
- Documentation depth
- The project wiki contains installation, usage, FAQ, troubleshooting, typical-symptom and exit-code pages.checked 19 Oct 2026
- Entity cleanup
- It can remove entities from chunks whose entity count exceeds a configured limit.checked 19 Oct 2026
- Independent derivative
- The Minecraft Region Checker documentation says its project was inspired by Minecraft Region Fixer and adds YAML reporting and Docker-oriented operation.checked 19 Oct 2026
- Independent integration
- SpigotMC documents wiring Region Fixer into Multicraft's Chunkster button through a server configuration file.checked 19 Oct 2026
- License
- The repository is marked GPL-3.0 and includes a COPYING.txt license file.checked 19 Oct 2026
- 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.checked 19 Oct 2026
- 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.checked 19 Oct 2026
- Limit: long scans
- SpigotMC warns that scans of large worlds can take considerable time and may appear frozen while processing.checked 19 Oct 2026
- 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.checked 19 Oct 2026
- Logging
- The --log option writes detailed scan results to a file.checked 19 Oct 2026
- Maintainer identity
- The README credits Alejandro Aguilera under the Fenixin name as creator.checked 19 Oct 2026
- Maintainer location
- The Fenixin GitHub profile lists Spain as the user's location.checked 19 Oct 2026
- 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.checked 19 Oct 2026
- Other uses
- The project says it can replace chunks or regions with a backup, remove entities, and help investigate world problems.checked 2 Oct 2026
Where it runs
- Linux installation
- Linux instructions recommend obtaining the source with Git and running it with the installed Python interpreter.checked 19 Oct 2026
- macOS installation
- macOS instructions call for Python and wxPython when using the GUI and otherwise follow the Linux approach.checked 19 Oct 2026
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