How do I open the downloaded world?

Unzip it and move the world folder into .minecraft/saves. It appears in your singleplayer list the next time you launch the game.

How large can the model be?

There is no structure or paste limit in a world, so builds far beyond 48 blocks work. Voxelization time and browser memory are the real constraints.

Can I choose which block the model is made of?

Yes. Since .stl has no colour, restricting the palette in the preview panel gives you full control over the material.

Why does the model look blockier than in my CAD tool?

Blocks sit on a fixed grid, so curves become stepped. Raising the build size reduces the stepping at the cost of a larger world.

Convert .stl to Java world

See a CAD or printable model at full scale in Minecraft Java. Bloxelizer voxelizes your .stl in the browser and packages the blocks as a Java world you can load in singleplayer.

Free & unlimited

Runs in your browser

3D & layer previews

Drop a Minecraft schematic

orBrowse

We'll detect the format, let you view your build layer by layer in 2D / 3D, and let you export it to any format.

.schem

.litematic

.bp

.mcstructure

.nbt

.schematic

.mcstructurezip

.mcworld

.zip(Java world)

.prefab.json

.json

.glb

.gltf

.obj

.mtl

.stl

.bbmodel

.geo.json

.png

.jpg

.jpeg

.webp

Or paste a URL

The .stl and Java world formats

An .stl file is a triangle mesh and nothing more — no colour, no materials — the format produced by CAD packages, scanners, and 3D printing workflows. A Minecraft Java world is a save folder of region (.mca) files plus a level.dat. The conversion voxelizes the triangles into blocks and writes them into a fresh world folder, downloaded as a .zip you unzip into your saves.

How to convert .stl to Java world

Upload your .stl file in the converter below.

Choose the build size, rotation, and block palette in the preview panel, then apply.

Keep the Java world format selected, download the .zip, and unzip it into your saves folder.

When to use this conversion

Best for large models — architectural exports, terrain scans, sculptures — where structure blocks and schematic pastes get in the way and you just want to walk through the shape.

Compatibility notes

Because .stl has no colour, the palette you select determines how the build looks. The model is written into a generated world, and very high build sizes are limited mainly by browser memory and voxelization time.