How to convert OBJ to STL
- Add your .OBJ file - drop it in the box above or click to browse.
- Convert it to .STL in a few seconds.
- Download your new .STL file.
What to expect
- Color, textures, and the
.mtlfile are not carried over - STL stores triangle geometry only; this is expected for 3D printing. - OBJ has no embedded unit definition; always verify scale in your slicer after converting and rescale if needed.
- The mesh should be watertight (closed manifold) for clean printing; open or non-manifold meshes may cause slicer errors - use MeshLab's cleaning filters to fix them first.
Frequently asked questions
Will color and texture be preserved in the STL?
No - STL stores geometry only. If you need color for a full-color printer, check whether your slicer accepts
.obj or .3mf directly.Do I need the .mtl file to convert?
No - only the
.obj file is needed; the .mtl and any texture images are ignored during conversion.Why does my slicer report errors after conversion?
The source
.obj likely had mesh issues (holes, flipped normals, non-manifold edges) that conversion does not fix; open the file in MeshLab, run the cleaning filters, and re-export.Will multiple objects in one OBJ all export to the STL?
Yes - most tools export all visible geometry into one
.stl by default; in Blender, use "Selection Only" in the export dialog to export a single object.Programs that convert OBJ: 3D Object Converter · AccuTrans 3D · CrossManager · PolyTrans|CAD+DCC · SolidWorks · 3D Builder · 3Data Expert · 3ds Max (3D Studio Max)
