Convert OBJ to 3MF
Convert a OBJ file to 3MF in your browser. Free, no upload, no sign-up.
Convert OBJ files to 3MF directly in your browser. The converter parses the OBJ mesh, rebuilds it in memory and writes it out as 3MF, keeping every triangle. Nothing is uploaded, there is no file size limit beyond your computer's memory, and the result downloads instantly. 3MF records the unit and can hold several objects with colors, so the model opens in the slicer at the right size without guessing.
How to convert OBJ to 3MF
- 1Drop your OBJ file
Drag a .obj file onto the box above or click to choose one. The companion .mtl file and textures are ignored. Geometry is imported completely.
- 2Check the preview
The model renders in 3D so you can confirm it loaded correctly. Dimensions, volume and triangle count are shown next to it; open edges are flagged if the mesh is not watertight.
- 3Download the 3MF
Adjust the export options if needed and click download. The exported file declares millimeters as its unit and contains the mesh as a single object.
What is a OBJ file?
OBJ is a plain-text mesh format from Wavefront. It stores vertices, normals, UV texture coordinates and face definitions, and references materials through a companion .mtl file. It is human-readable and supported by virtually every 3D modelling application.
Commonly used by: Blender, Maya, ZBrush, game engines, photogrammetry tools
The companion .mtl file and textures are ignored. Geometry is imported completely.
What is a 3MF file?
3MF is the modern replacement for STL, published by the 3MF Consortium (Microsoft, Autodesk, HP, Prusa and others). It is a ZIP archive containing XML that stores units, colors, materials, multiple objects and print settings. Slicers such as Bambu Studio and PrusaSlicer use it as their project format.
Commonly used by: Bambu Studio, PrusaSlicer, Cura, Windows 3D Builder, Fusion 360
3MF records the unit and can hold several objects with colors, so the model opens in the slicer at the right size without guessing.
OBJ vs 3MF
| OBJ | 3MF | |
|---|---|---|
| Full name | Wavefront OBJ | 3D Manufacturing Format |
| Encoding | Text | ZIP container |
| Geometry type | Triangle mesh | Triangle mesh |
| Colors | No | Yes |
| Textures | Yes | Yes |
| Materials | Yes | Yes |
| Stores units | No | Yes |
| Multiple objects | Yes | Yes |
| Typical use | Blender, Maya, ZBrush | Bambu Studio, PrusaSlicer, Cura |