File Format
What Is a GLB File?
GLB is the binary packaging of glTF, and it's become the default output format for web viewers, AR/VR apps, game engines and AI 3D generators (Meshy, Tripo, Hunyuan). Unlike STL or plain OBJ, a single .glb file bundles the mesh, its PBR materials, textures and any animation together — nothing else to attach or lose.
What GLB can and can't store
- YESGeometry. Full mesh data, same as STL and OBJ.
- YESUV coordinates. Texture mapping is part of the spec.
- YESPBR materials and textures. Colors, texture images and physically-based material properties are embedded in the same file.
- YESAnimation. Rigged and keyframe animation are supported natively.
- YESSingle file. Binary glTF packs the JSON scene graph, geometry and textures into one .glb — its sibling format, .gltf, has the same capabilities but splits them into separate JSON, binary and texture files.
Common problems with GLB files
- COMMONLooks fine, doesn't print. Web and AR viewers render GLBs regardless of manifoldness, so a model can look perfect on screen while still having non-manifold edges or holes that a slicer will reject.
- COMMONLarge file sizes. Textures are embedded directly in the binary, so a GLB with high-resolution material maps can be far larger than the geometry alone would suggest.
- HONESTMaterials and animation don't survive conversion. Converting a GLB down to STL or OBJ keeps the geometry but drops colors, textures and animation — those formats simply have nowhere to store them.
Convert GLB to another format
Got a broken STL, GLB or OBJ file?
Fix non-manifold edges, holes and floating debris — free, and it never leaves your browser.
Try our free repair toolDiagnosis & basic repairFree
Deep repair (keeps colors)20 credits
Image to 3D generation30 credits
100 credits$9.90
All plans →