Free online OBJ to BREP converter
How to convert OBJ mesh files to precise BREP CAD models using FreeCAD, Rhino, or Fusion 360.
Convert OBJ to BREP online - free
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How to convert obj to brep file
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Understanding the OBJ and BREP file formats
OBJ is a widely used 3D geometry definition file format developed by Wavefront Technologies. It stores 3D models as a collection of vertices, faces, normals, and texture coordinates, making it ideal for mesh-based modeling and exchange between various 3D graphics applications.
BREP (Boundary Representation) is a CAD file format that describes the geometry and topology of 3D solids using mathematical surfaces and curves. BREP files are commonly used in engineering and manufacturing for precise modeling, as they support advanced features like parametric surfaces and solid operations.
Why convert OBJ to BREP?
Converting OBJ to BREP is essential when you need to transition from mesh-based 3D models to precise, editable CAD models. This is often required for engineering, manufacturing, or further parametric design work, as BREP supports more advanced modeling operations than OBJ.
How to convert OBJ to BREP
OBJ to BREP conversion involves transforming a polygonal mesh into a boundary representation solid. This process is not always straightforward, as it may require mesh repair, surface fitting, and manual adjustments. Here are the general steps:
- Import the OBJ file into a CAD or 3D modeling software that supports both formats.
- Convert the mesh to a solid or surface (often called 'meshing to solid' or 'reverse engineering').
- Export or save the resulting model as a BREP file.
Best software for OBJ to BREP conversion
- FreeCAD: An open-source CAD tool that can import OBJ files and convert meshes to solids. Use File → Import to load the OBJ, then use the Part workbench to convert the mesh to a shape and export as BREP via File → Export.
- Rhino 3D: A commercial 3D modeling tool with robust mesh-to-NURBS conversion. Import the OBJ, use MeshToNURB command, then export as BREP.
- Autodesk Fusion 360: Supports mesh import and conversion to solid bodies, which can then be exported as BREP.
Tips for successful conversion
- Ensure the OBJ mesh is clean and manifold to avoid errors during conversion.
- High-polygon meshes may require simplification for better results.
- Manual adjustments may be necessary to achieve a watertight solid in BREP.
Note: This obj to brep conversion record is incomplete, must be verified, and may contain inaccuracies. Please vote below whether you found this information helpful or not.
OBJ vs BREP: format comparison
How the OBJ and BREP formats compare on the properties that matter most for this conversion.
| Property | .OBJ Wavefront OBJ | .BREP Boundary Representation |
|---|---|---|
| Open standard | Yes | Partly open |
| Compression | Uncompressed | Uncompressed |
| Typical file size | Medium | Medium |
| Opens in a web browser | No | No |
| Further editing | Easy | Limited |
| Metadata support | Basic | Basic |
| Plain-text readable | Yes | No |
| Best used for | Data exchange | Professional production |
| Introduced | 1990 | — |
| Developer | Wavefront Technologies | — |
| MIME type | model/obj | — |
Frequently asked questions
Is the OBJ to BREP converter free?
Yes, converting OBJ to BREP on 101convert.com is completely free. No registration, email address or installation is required. If you need a higher file size limit or want to convert more files at once, see our plans.
How large can my OBJ file be?
You can upload OBJ files up to 500 MB and convert up to 5 files at once in a single batch.
What happens to my uploaded files?
Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.
Do I need to install any software to convert OBJ to BREP?
No. The OBJ to BREP conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.
Did the conversion fail?
In most cases, the cause is an incorrect file format. Please upload a valid OBJ file for this OBJ to BREP conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.