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Minecraft Region Fixer
What it is
Minecraft Region Fixer is a free command-line utility for locating and addressing problems in Minecraft region files and world folders. It can replace corrupted chunks or regions with copies from an older backup. When no backup exists, it can remove corrupted chunks so Minecraft can regenerate them. The program scans level.dat and player .dat files and prints warnings, but it does not repair those files. Other documented uses include removing entities and investigating world problems. It runs on Windows, Linux, and macOS with Python 3.x; Python 2.x is unsupported. Command-line options allow parallel scanning, detailed log output, and deletion of broken chunks, broken region files, or excessive entities. These actions can alter a world, and the project recommends making a backup because bugs may exist. Minecraft Region Fixer supports .mca region files and Minecraft world folders and is licensed under GPL-3.0.
For and against
For
- Free and GPL-3.0 licensed
- Works on Windows, Linux, and macOS
- Can restore chunks from backups
- Supports parallel scans and detailed logs
- Handles region files and world folders
Against
- Requires Python 3.x
- Does not repair level.dat or player files
- Deletion options can alter worlds
- Command-line interface may require technical comfort
The verdict
Minecraft Region Fixer provides focused tools for diagnosing and changing damaged Minecraft worlds. Backups are important, especially before using its deletion options.
Who it suits
This tool suits Minecraft players or administrators who can use a Python command line to inspect and repair world data. It is useful when backups or regeneration can address damaged chunks.
Plans and prices
Source code
GPL-3.0 code · Python 3.x required · local command-line use
Read 19 Oct 2026 · github.com
Minecraft Region Fixer
GPL-3.0 licensed · requires Python 3.x
Read 2 Oct 2026 · github.com
On the record
- 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.github.com · read 19 Oct 2026
- Batch scanning
- The usage guide supports scanning a complete world, individual region files, arbitrary region-file sets and multiple worlds.github.com · read 19 Oct 2026
- Command line
- The README documents running the program with Python, including the command python regionfixer.py --help.github.com · read 2 Oct 2026
- Command-line interface
- The documented primary workflow runs regionfixer.py from a terminal with Python.github.com · read 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.github.com · read 19 Oct 2026
- Corrupted chunks
- It can replace corrupted chunks in region files using old backup copies of a Minecraft world.github.com · read 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.github.com · read 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.github.com · read 19 Oct 2026
- Documentation depth
- The project wiki contains installation, usage, FAQ, troubleshooting, typical-symptom and exit-code pages.github.com · read 19 Oct 2026
- Entity cleanup
- It can remove entities from chunks whose entity count exceeds a configured limit.github.com · read 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.minecraft-world-manager.readthedocs.io · read 19 Oct 2026
- Independent integration
- SpigotMC documents wiring Region Fixer into Multicraft's Chunkster button through a server configuration file.spigotmc.org · read 19 Oct 2026
- License
- The repository is marked GPL-3.0 and includes a COPYING.txt license file.github.com · read 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.minecraftforum.net · read 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.reddit.com · read 19 Oct 2026
- Limit: long scans
- SpigotMC warns that scans of large worlds can take considerable time and may appear frozen while processing.spigotmc.org · read 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.minecraftforum.net · read 19 Oct 2026
- Linux installation
- Linux instructions recommend obtaining the source with Git and running it with the installed Python interpreter.github.com · read 19 Oct 2026
