Do I need to upload the .mtl file as well?

Only if you want the model's colours. Select the .obj, its .mtl, and the texture images together and the converter resolves the material references automatically. Without them the mesh is voxelized as plain geometry.

How large will the Minecraft build be?

That is up to you. The preview panel exposes a build size, and the model is rescaled to it before voxelization, so the same .obj can produce a 30-block statue or a 300-block landmark.

Is the result hollow or solid?

Voxelization samples the mesh surface, so the export follows the model's shell. That keeps block counts manageable and matches how most builders place a large model in survival or creative.

Does the conversion upload my model to a server?

No. The .obj is parsed and voxelized in your browser, and the .schem is written locally. The model never leaves your machine.

Convert .obj to .schem

Turn a 3D model into a Minecraft build. Bloxelizer reads your .obj — along with its .mtl and textures, if you select them too — voxelizes it in your browser, and exports a WorldEdit-compatible .schem.

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 .obj and .schem formats

.obj is Wavefront's plain-text mesh format: a list of vertices and the faces between them, with colours and textures kept in a companion .mtl file and the image files it points at. A Sponge .schem is the opposite kind of thing — gzipped NBT holding a fixed grid of namespaced Minecraft block states for WorldEdit and FAWE. Converting between them is a voxelization rather than a re-encoding: the model's surface is sampled onto a block grid at the resolution you choose, and each sampled colour is matched to the nearest block in your palette.

How to convert .obj to .schem

Select your .obj file — together with its .mtl and texture images, if it has them — in the converter below.

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

Leave .schem selected as the export format and download the result.

When to use this conversion

Use this route when you have a model from Blender, Maya, or a 3D asset site and want it as a buildable Minecraft structure you can paste with WorldEdit or FAWE.

Compatibility notes

Colours only survive if you select the .mtl file and its texture images alongside the .obj; an .obj on its own voxelizes as untextured geometry. Large build sizes produce schematics that some servers refuse to paste, so check the block count in the 3D preview before exporting.