Long-lived Minecraft worlds grow: every exploration session writes new chunks to disk forever, and most of them are terrain somebody flew over once. A bloated world means slow backups, slow uploads and slow restores. MCA Selector shrinks a world in two honest ways — deleting chunks that carry no value, and defragmenting the region files…
A major Minecraft update lands — new terrain, new structures, new ores — and your old world has millions of already-generated chunks locking the new content out. Pruning is the fix: delete the chunks nobody uses so they regenerate with the new generator, while the chunks containing your builds stay exactly as they are. This…
Every operation in MCA Selector starts with a selection, so the selection tools repay learning properly. This guide covers all of them: rectangle and brush selection, the chunk/region mode switch hidden in the zoom level, Invert and Clear, the Add and Subtraction modes, and saving selections to CSV so a careful selection never has to…
Most of MCA Selector works on thousands of chunks at once. The Chunk Editor is the opposite: a tree editor for the raw NBT data of exactly one chunk — its terrain data, its points of interest and its entities. It is the microscope you reach for when you need to see, or surgically fix,…
The NBT Changer is MCA Selector’s batch editor: pick chunks, pick fields, and the tool rewrites those fields in every selected chunk in one run. It is how you fix a thousand chunks’ DataVersion, flatten biomes, strip entities or force terrain blending without opening a single chunk by hand — and because it writes straight…
Selecting chunks by hand works for a village. It does not work for “every chunk this world generated before 1.20” across a 40,000-chunk world. That is what the chunk filter is for: you describe the chunks you want with conditions — DataVersion, InhabitedTime, biome, entities and more — and MCA Selector builds the selection (or…
Exporting and importing is how you move a castle, a city district or a whole spawn area from one world into another — or archive a build as standalone chunk files. MCA Selector handles both directions: exports write a portable chunk package, imports merge chunks into a target world with control over exactly where they…
Want a plains base in a desert, or a frozen harbour where the game generated a warm ocean? MCA Selector can rewrite a chunk’s biome — with one important limitation you need to understand first: in the current tool, a biome change applies to the whole chunk at once. There is no biome brush. Here…
“Resetting” a chunk in Minecraft means deleting it so the game generates it again from scratch — with the terrain, ores and structures of the version you are running now. It is how old worlds get new-update caves, ores and biomes without starting over. MCA Selector does not have a separate reset button: a reset…
Deleting chunks is the core job of MCA Selector: clear old terrain so it regenerates, remove corrupted chunks, or strip a world down to the parts players actually use. The operation itself is three clicks — the skill is in selecting exactly the right chunks, because deletion is instant and cannot be undone. Back up…
