MCA Selector: precise chunk management for Minecraft Java worlds
Select, export, and delete chunks inside .mca files using an interactive top-down map, with rectangle, polygon, and single-chunk selection tools. MCA Selector, created by Querz for utilities-tools, pairs high-speed processing with NBT-based filters and an NBT Changer for batch edits. The app targets Minecraft: Java Edition players, map makers, and server administrators who need to prune large world saves or migrate specific chunks between maps without opening the game.
What does MCA Selector actually do?
The tool loads .mca region files and visualises them as a top-down map, letting you mark chunks with rectangle, polygon, or individual selection. It can delete marked chunks, export and import chunks between saves, and apply batch edits via the NBT Changer. The filter system can target chunks by coordinates, data version, or NBT fields such as InhabitedTime or entity presence, so selections are data-driven rather than purely visual.
Does it affect system performance when processing large worlds?
The app is built for high-performance rendering and multi-gigabyte world files, so it handles large saves without pausing the interface. It requires a 64-bit Java Runtime Environment and typically needs 4GB to 6GB of RAM for big worlds, which defines the machine profile required for smooth operation. Processing speed scales with available memory and the Java runtime version you run.
Is it safe to run on a live server world or production machine?
MCA Selector directly modifies and deletes chunk data, so safety depends on workflow: the tool modifies files on disk and the documentation recommends making a full backup before use. Some antivirus programs may flag the installer or JAR as false positives because it is an unsigned executable; downloading from the official repository reduces that risk. The app’s read/write actions mean you should not operate on a live world without a prior backup.
Do I need technical knowledge to use it correctly?
The interface offers guided map selection and basic export/import controls for straightforward tasks, while advanced filtering and NBT editing require familiarity with chunk metadata and NBT structure. Map makers and server admins who know coordinates and NBT terms can apply granular rules like "delete chunks with InhabitedTime below X." Casual players can perform simple selections, but complex filters assume some technical knowledge.
MCA Selector suits technically minded players and server admins who manage large saves
The tool reliably handles large .mca files and supports precise, data-driven pruning and chunk migration, provided you run it on a 64-bit Java environment and keep backups before changes. Expect a learning curve for NBT filters, and factor in antivirus false positives when sourcing the installer. Recommended.
