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STP OBJ
Free online converter

Convert STP to OBJ

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STP to OBJ converterFREE
Drop a .STP file here
or pick one - we convert it to .OBJ and give you the file to download

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert STP to OBJ

  1. Add your .STP file - drop it in the box above or click to browse.
  2. Convert it to .OBJ in a few seconds.
  3. Download your new .OBJ file.

What to expect

  • Exact B-rep geometry becomes a polygon mesh - once converted, the precise surface data is gone and cannot be recovered from the .obj.
  • Curved surfaces are approximated with triangles; use a finer tessellation setting in FreeCAD or CAD Assistant to reduce visible faceting on rounded edges.
  • Standard .stp files (AP203/AP214) carry no color or material data, so the exported .obj typically has geometry only, with no .mtl material file.

Frequently asked questions

Is converting STP to OBJ free?
Yes - our converter on this page is free, and FreeCAD and CAD Assistant are also free to download and use without limits.
Will the OBJ look identical to the STP model?
The shape matches, but curved surfaces are approximated with polygons; at high tessellation quality the difference is barely visible, but at low quality you will see faceting on rounded edges.
Can I convert OBJ back to STP?
Not meaningfully - OBJ is a mesh with no precise geometry, so you would get a mesh body in the CAD file rather than a proper solid you can edit or measure.
Are .stp and .step the same format?
Yes - .stp and .step are two extensions for the same ISO 10303 format; either file works with the converter and tools above.
Learn about the formats: .STP · .OBJ
Programs that convert STP: 3D Object Converter · PolyTrans|CAD+DCC · 3ds Max (3D Studio Max) · Autoconverter · TransMagic · Afanche 3D Viewer for Mac · FreeCAD · Online CAD converter