Free online BREP to GLB converter

What the BREP format is

BREP, or boundary representation, describes a solid through its faces, edges, vertices, surface definitions, and topology. It is used by mechanical CAD and solid-modeling systems because the geometry remains mathematically precise and can support operations such as filleting, sectioning, measuring, and Boolean cuts.

Files commonly use .brep or .brp extensions and are associated with Open CASCADE-based applications, FreeCAD, CAD Exchanger, and custom engineering software. You may encounter them when exporting a part from a CAD system, receiving geometry from an engineering workflow, or working with Open CASCADE sample and exchange data.

What the GLB format is

GLB is the single-file binary form of glTF 2.0. It stores a 3D mesh, scene hierarchy, materials, textures, and related metadata in one file, making it suitable for browsers, WebGL viewers, game engines, AR pipelines, and many digital-content tools.

Unlike BREP, GLB normally contains triangulated or polygonal surface data, not editable parametric solids. Its compact packaging, predictable runtime structure, and support for physically based materials make it more convenient for distribution and interactive display than a CAD exchange format.

How to convert BREP to GLB

Using the online converter

1. Open the BREP-to-GLB converter on 101convert.com; it can be used free without installing desktop software.
2. Upload the .brep or .brp file.
3. Select GLB as the output format and start the conversion.
4. Download the generated .glb file and open it in a GLB-capable viewer or target application.

The service must tessellate the CAD surfaces during conversion. If an import or export option is available, use a higher mesh-resolution or lower chord-deviation setting for curved parts, and enable normals when the destination supports them.

Using desktop CAD software

CAD Exchanger is a practical desktop option because it can read BREP geometry and export glTF/GLB. Open the file with File → Open, inspect the imported body, then use File → Export and select .glb. In the tessellation or mesh settings, reduce chordal deviation for greater geometric accuracy and set an appropriate maximum edge length for the target viewer.

FreeCAD can also be used when the installed release provides GLB or glTF export. Import the model with File → Open or File → Import, select the Part workbench if needed, and export the visible object through File → Export as .glb or .gltf. If only .gltf export is available, the result may reference separate binary and texture files rather than being a single GLB; use a glTF packaging tool afterward or choose GLB directly in a newer release.

Quality and compatibility limits

BREP-to-GLB conversion is inherently a CAD-to-mesh conversion. Small fillets, holes, sharp edges, and curved surfaces can lose accuracy if the tessellation tolerance is too coarse. Excessively fine tessellation preserves detail but increases polygon count, memory use, and loading time.

BREP appearance data is not guaranteed to map directly to glTF materials. Object colors may transfer, but CAD-specific shaders, layered materials, annotations, construction geometry, constraints, and parametric edit history generally do not. Verify units after export because glTF does not preserve every CAD application's unit convention in the same way; check the model scale in the destination application.

If the BREP contains multiple solids, confirm that the converter preserves them as separate nodes when selection, animation, or per-part materials matter. For later engineering edits, retain the original BREP and use GLB only as a visualization or delivery copy.