Convert STEP to OBJ
Convert a STEP file to OBJ in your browser. Free, no upload, no sign-up.
Convert STEP files to OBJ directly in your browser. The converter reads the exact STEP geometry with the OpenCascade CAD kernel running in WebAssembly, tessellates it at the quality you choose and writes a OBJ file. Nothing is uploaded, there is no file size limit beyond your computer's memory, and the result downloads instantly. OBJ keeps groups and UV coordinates and opens in every modelling tool, which makes it a good format for editing or texturing a model.
How to convert STEP to OBJ
- 1Drop your STEP file
Drag a .step file onto the box above or click to choose one. The exact geometry is tessellated into triangles in your browser using OpenCascade (the same kernel FreeCAD uses). You can control the mesh density before exporting. Large assemblies may take a while; the first load downloads a 7 MB engine.
- 2Pick the mesh quality
Fine gives smoother curves and a larger file, coarse keeps large assemblies light. The default suits most 3D printing jobs.
- 3Check the preview
The model renders in 3D so you can confirm it loaded correctly. Dimensions, volume and triangle count are shown next to it; open edges are flagged if the mesh is not watertight.
- 4Download the OBJ
Adjust the export options if needed and click download. A .mtl material file is not generated; the exported OBJ contains geometry, normals and UVs only.
What is a STEP file?
STEP (ISO 10303, files ending in .step or .stp) is the neutral CAD exchange format. Unlike mesh formats it stores exact B-rep geometry: analytic surfaces, NURBS, edges and assembly structure with real units. Every CAD system can export STEP, and it is what you receive from suppliers, McMaster-Carr or GrabCAD.
Commonly used by: SolidWorks, Fusion 360, Onshape, FreeCAD, CATIA, Siemens NX, machine shops
The exact geometry is tessellated into triangles in your browser using OpenCascade (the same kernel FreeCAD uses). You can control the mesh density before exporting. Large assemblies may take a while; the first load downloads a 7 MB engine.
What is a OBJ file?
OBJ is a plain-text mesh format from Wavefront. It stores vertices, normals, UV texture coordinates and face definitions, and references materials through a companion .mtl file. It is human-readable and supported by virtually every 3D modelling application.
Commonly used by: Blender, Maya, ZBrush, game engines, photogrammetry tools
OBJ keeps groups and UV coordinates and opens in every modelling tool, which makes it a good format for editing or texturing a model.
STEP vs OBJ
| STEP | OBJ | |
|---|---|---|
| Full name | Standard for the Exchange of Product Data (ISO 10303) | Wavefront OBJ |
| Encoding | Text | Text |
| Geometry type | Exact (B-rep / curves) | Triangle mesh |
| Colors | Yes | No |
| Textures | No | Yes |
| Materials | No | Yes |
| Stores units | Yes | No |
| Multiple objects | Yes | Yes |
| Typical use | SolidWorks, Fusion 360, Onshape | Blender, Maya, ZBrush |