How to convert STL to OBJ
- Add your .STL file - drop it in the box above or click to browse.
- Convert it to .OBJ in a few seconds.
- Download your new .OBJ file.
What to expect
- OBJ exports as two files - a
.obj(geometry) and a.mtl(materials) - keep them in the same folder when sharing. - Color and textures are not transferred automatically; the converted OBJ contains only geometry, since STL has no color data to copy.
- Both formats are unitless; if the model appears at the wrong scale, adjust by a factor of 25.4 between millimetres and inches.
Frequently asked questions
Is any geometry lost when converting STL to OBJ?
No - both formats store triangle meshes and vertex positions transfer exactly; no simplification or approximation occurs.
Can I add textures to the OBJ after converting?
Yes. Open the
.obj in Blender, UV-unwrap the mesh, and assign textures - OBJ supports this natively, which is one of the main reasons to convert from STL.Why does my converted OBJ come with a .mtl file?
OBJ separates geometry (
.obj) from material data (.mtl); keep both files in the same folder or some applications may show warnings when opening the model.Will converting STL to OBJ improve 3D print quality?
No - slicers accept both formats and mesh detail is fixed when the STL was first created; converting to OBJ does not add triangles or increase resolution.
Programs that convert STL: 3D Object Converter · AccuTrans 3D · PolyTrans|CAD+DCC · 3D Builder · 3ds Max (3D Studio Max) · Autoconverter · IVCon · meshconv
