How to convert STEP to OBJ
- Add your .STEP 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
- Smooth curved surfaces in STEP (NURBS) become triangle facets in OBJ - increase the mesh quality setting at export to reduce visible faceting.
- STEP may carry per-part colour data, but UV maps and textures are not transferred; assign materials in your 3D tool after importing the OBJ.
- Conversion is one-way - the original exact solid geometry cannot be reconstructed from the resulting mesh.
Frequently asked questions
Will the OBJ look exactly like the STEP model?
Close, but not identical. NURBS surfaces in STEP become polygonal facets in OBJ. At high mesh quality the difference is invisible in a render, but it exists mathematically.
Are .step and .stp the same format?
Yes - both extensions refer to the same ISO 10303-21 standard and can be renamed interchangeably without affecting the file.
Can I convert a STEP assembly with multiple parts?
Yes. FreeCAD and CAD Assistant both handle assemblies; parts may be merged into one mesh or kept separate depending on the export settings - check the result in your 3D tool after import.
Is there a file-size limit for the online converter?
The converter handles most STEP files; very large or complex assemblies may time out, in which case a desktop tool like FreeCAD is the more reliable option.
Programs that convert STEP: 3D Object Converter · PolyTrans|CAD+DCC · 3ds Max (3D Studio Max) · Autoconverter · Afanche 3D Viewer for Mac · FreeCAD · Online CAD converter · Babel3D
