Bedrock NBT Editor vs Minecraft Region Fixer

Bedrock NBT Editor is a free browser-based tool for editing Minecraft Bedrock Edition and Java Edition NBT files. It accepts files such as level.dat, playerdata, .nbt, .mcstructure, .schem, and .schematic, and detects byte order, headers, and compression across five NBT encodings. Users can search tags, add or remove them, change values, and download the edited file. The editor can also export the tree as SNBT text and convert between Bedrock files and Java big-endian gzip format. For large files, typed arrays and lazy rendering display 200 entries at a time; BigInt preserves 64-bit TAG_Long values such as world seeds and UUID halves. Files are parsed locally, with no upload endpoint, and the editor continues to work offline after the page loads. Android users can choose a world file from a file manager; iOS users must first put it in the Files app. The project is open source under the MIT license. The maker says it is not affiliated with Mojang Studios or Microsoft.

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.