Free STEP to OBJ converter
Convert STEP to OBJ, assembly parts and all.
Bring engineering models into Blender, Cinema 4D, 3ds Max or a game engine. Drop a STEP file and get an OBJ with each named part as its own group.
Why convert STEP to OBJ?
Product renders, configurators, animations and visualisations start from CAD data, but DCC tools and renderers want meshes. OBJ is the most widely supported mesh format and keeps part structure as groups.
How to convert STEP to OBJ
- Choose your STEP or STP file above, or drag it onto the box.
- Check that OBJ is selected. You can switch to any other output.
- Select Convert. The file downloads straight away. Nothing is uploaded.
Good to know
- Shared vertices are welded, so the OBJ is compact and smooth-shades correctly after you set normals in your 3D tool.
- STEP files are usually in millimetres. Scale by 0.001 in Blender if your scene uses metres.
- For web or AR viewing, convert to GLB instead.
What converts, and what doesn't
- Every output is a triangle mesh. STEP and IFC solids are tessellated for display, so the result is not an editable solid or B-rep.
- When the source names its parts (STEP and IFC assemblies, for example), they become named groups in OBJ. STL, PLY and GLB hold a single combined mesh.
- Colours and materials are not carried over.
- Coordinates keep the source units, except GLB, which is scaled to metres when the source declares its units.
Frequently asked questions
Are colours and materials included?
No. The OBJ contains geometry and part groups only, so assign materials in your 3D tool.
Is my file uploaded?
No. The file is read and converted by the Caddis engine running inside your browser tab. It is never sent to a server, so confidential drawings stay on your device.
Is it really free?
Yes. There's no account, watermark, page limit or daily quota. The converter runs on your own computer, so it costs us nothing per file.
Need to measure or mark up the drawing too?
The same engine powers the free Caddis viewer on the web and on iPhone. Open DWG, DXF, STEP and STL files, measure, and add markup, all on your device.
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Universal CAD converterDWG version checkerDWG to DXFDWG to PDFDWG to SVGDWG to PNGDXF to PDFDXF to SVGDXF to PNGDXF to R12 DXFSTEP to STLSTEP to GLBSTL to OBJOBJ to STLSTL to GLBPLY to STLIFC to OBJIFC to GLBSLDPRT to STL