GLB to FBX Converter

GLB and FBX solve slightly different problems, which is exactly why converting between them is not always a lossless round trip. GLB is a self-contained binary built for the web: geometry, PBR materials and textures all live in one file, and it supports skeletal animation through a simpler node-and-skin system. FBX is older, built for DCC-to-engine pipelines, and carries a richer scene graph: named object hierarchies, pivots separate from the mesh origin, multiple named material slots, and full skeleton plus animation-clip support that Unity and Unreal both read natively. Converting GLB to FBX generally preserves geometry, UVs and basic materials cleanly, but you should always verify pivots and any skinning after the conversion rather than assuming a 1:1 result.

The most reliable free path is Blender, because it has first-class importers and exporters for both formats maintained as core functionality. Import the GLB through File then Import then glTF 2.0, which brings in the mesh, node hierarchy and any PBR materials as Principled BSDF shaders. Before exporting, check three things: object origins are where you want them (add an Empty at the base or center if the imported pivot is wrong), normals are correct (Shift N to recalculate if shading looks inverted), and material names are sensible for the Materials tab you will use later in Unity. Then use File then Export then FBX, choosing Selected Objects if you only want part of the scene, and enabling Apply Transform so scale and rotation bake in cleanly rather than surviving as a leftover 90-degree rotation inside the engine.

What survives the conversion depends entirely on what the GLB actually contains. A static mesh with baked flat-color or gradient materials converts essentially perfectly: geometry, UVs and vertex colors carry through, and Unity or Unreal will read the FBX exactly as you saw it in Blender. A rigged, animated GLB is more delicate: Blender imports the skeleton and skin weights correctly in almost all cases, but you should scrub the animation timeline after import to confirm bones deform as expected before you export, since a bad import here produces a pinched or twisted rig that is much harder to debug once it is inside Unity. If the GLB used advanced material features like clearcoat or transmission that FBX has no equivalent for, expect those channels to be dropped or approximated, so plan to rebuild anything highly stylized as a simple base-color-plus-roughness setup for the FBX version.

Texture handling is the detail most people get wrong. GLB embeds its textures inside the binary file, so after importing into Blender the images exist as packed data, not as loose files on disk. Before exporting FBX, unpack the textures (File then External Data then Unpack All Into Files) so Unity or Unreal has actual image files to reference rather than a broken link. Keep every texture in one shared atlas exactly as the source GLB intended, 512 to 1,024px for props and 1,024 to 2,048px for a hero asset, since splitting materials apart during conversion is the single most common way an efficient low poly kit turns into a draw-call-heavy mess after import.

For a quick one-off conversion without opening Blender, command-line tools like Facebook's FBX2glTF (reversed) or the assimp library can convert GLB to FBX in a script or CI pipeline, which is worth setting up if you are converting dozens of generated assets at once for an asset-pack release. For anything with a rig, animation, or unusual materials, though, the Blender round trip is worth the extra minute because you get a visual check before the file ever reaches your engine. Whichever path you use, the source GLB and the converted FBX are both yours: AI-generated models on this site are fully owned by you and cleared for commercial use with no attribution required, so converting formats never introduces a licensing question, only a technical one.