Free OBJ to GLB Converter
Lightning-fast OBJ to GLB conversion — 100% in your browser. Your files never leave your device. Free, no watermark, no sign-up.
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Supports GLB, GLTF, OBJ, STL, FBX, PLY
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OBJ vs GLB
See what transfers when converting between these two formats.
| Feature | OBJ | GLB |
|---|---|---|
| Geometry | ||
| Textures | ||
| Materials | ||
| Animation | ||
| Rigging |
All features supported by OBJ are preserved in GLB.
Why convert OBJ to GLB?
Modernize legacy asset libraries
OBJ libraries from the 2000s and 2010s can be re-packaged as GLB for direct use in Three.js, model-viewer, Babylon.js, and WebXR.
Single-file web delivery
Stop shipping .obj + .mtl + texture images as separate HTTP requests. GLB bundles everything into one cacheable file.
AR and WebXR deployment
Apple Quick Look, Google Scene Viewer, and WebXR frameworks all expect GLB. Convert OBJ assets before pushing them into AR experiences.
Tips for OBJ → GLB
Bring the whole folder
OBJ needs the .obj, .mtl, and every referenced texture image present. Fast3D parses the .mtl to find textures — missing files produce a working GLB with no textures.
Use relative texture paths
If the .mtl references textures by absolute path (e.g. `C:\users\...\diffuse.png`), the conversion still works but you cannot relocate the source folder. Prefer relative paths.
Check coordinate orientation
OBJ is often Z-up; GLB is Y-up. Fast3D handles this automatically, but if your model lands sideways in the viewer, your OBJ may use a non-standard convention.
Inspect material count
OBJ supports multiple materials per mesh via the `usemtl` directive. Each becomes a material entry in the GLB — verify nothing got merged or dropped.
Common issues when converting OBJ to GLB
Converted GLB has no textures
Fix
The .mtl file's texture paths do not resolve next to the .obj. Check that every image file referenced in the .mtl exists. Some .mtl files reference textures by absolute paths — edit them to relative paths.
Model appears black or unlit
Fix
The OBJ has no material assigned, or the .mtl file is missing. Without a material, GLB defaults to a flat grey that can look black under poor lighting. Add an .mtl file with at least a diffuse color.
Multiple objects merge into one
Fix
OBJ groups (g) and objects (o) map to GLB nodes. If your source OBJ used only `o` directives without `g`, some merging can occur. Inspect with the model-viewer tool to confirm the scene graph.