Convert GLTF to FBX Online (Free & Secure)
iLove3DM converts glTF files to FBX online and free: .gltf in, .fbx out. glTF is a JSON scene description that references separate .bin and image files, while FBX is a proprietary Autodesk container, usually binary; the converter bridges the two using GLB as an intermediate scene.
Select .GLTF file
or drag & drop .gltf file here
Try the new iLove3DM Studio
Get a better experience in our new Studio: a full-screen 3D viewer, live preview and all tools in one workspace. This classic page keeps working as before.
⚡ AI Summary & Quick Answer
iLove3DM converts glTF files to FBX online and free: .gltf in, .fbx out. glTF is a JSON scene description that references separate .bin and image files, while FBX is a proprietary Autodesk container, usually binary; the converter bridges the two using GLB as an intermediate scene.
Taking a web-ready asset into a desktop modelling format is the classic hand-off from publishing back to production. glTF (.gltf) is a JSON scene description that references separate .bin and image files. It holds indexed triangle meshes with optional morph targets and skins and is most often opened in Blender, Visual Studio Code glTF tools, and three.js. FBX (.fbx) is a proprietary Autodesk container, usually binary, holding polygon meshes with layered UVs, skins, blend shapes and scene hierarchy, and is typically used in Unity, Unreal Engine, and Maya.
Because glTF uses PBR metallic-roughness materials while FBX uses Lambert or Phong materials with optional PBR extensions, the converter reads your scene, applies the mapping described below and writes a clean .fbx file. Everything runs in your browser or an isolated, auto-purged instance, so models stay private.
.gltfAbout glTF (JSON)
Standard open-source 3D scene description format using JSON with external or embedded buffers and textures.
- Structure: a JSON scene description that references separate .bin and image files
- Materials: PBR metallic-roughness materials
- Units: meters (fixed by the glTF specification)
- Axis: Y-up, right-handed
- Opens in: Blender, Cesium, three.js or any glTF 2.0 viewer
.fbxTarget format: FBX (Autodesk Filmbox)
Industry-standard exchange format for games, animation, and visual effects supporting complex skeletal rigs and blend shapes.
- Structure: a proprietary Autodesk container, usually binary
- Materials: Lambert or Phong materials with optional PBR extensions
- Units: centimeters by default, with a settable unit scale
- Axis: Y-up by default, but exporters can change it
- Opens in: Unity, Unreal Engine, Maya, 3ds Max or Blender
What happens to your data in glTF → FBX conversion
Conversion route: glTF → GLB → FBX (parsed into a GLB scene, then exported as FBX).
| Aspect | Result | Outcome |
|---|---|---|
| Geometry | Preserved | glTF stores indexed triangle meshes with optional morph targets and skins; FBX stores polygon meshes with layered UVs, skins, blend shapes and scene hierarchy. Surfaces are retriangulated where needed and positions, normals and UV coordinates are carried across. |
| Materials | Adapted | glTF uses PBR metallic-roughness materials. FBX only supports Lambert or Phong materials with optional PBR extensions, so values are mapped to the closest equivalent and advanced PBR channels may be simplified. |
| Textures | Adapted | In glTF, textures are stored as external image files or data URIs. In FBX, textures may be embedded or referenced externally depending on the exporter, so texture handling is reduced to what the target supports. |
| Vertex colours | Preserved | Per-vertex colours in glTF are written to FBX as vertex colour data. |
| Animation | Preserved | glTF provides skeletal, node and morph-target animation; FBX supports it as well, so clips can travel with the model. |
| Units & scale | Adapted | glTF uses meters (fixed by the glTF specification); FBX uses centimeters by default, with a settable unit scale. Check the scale in your target application, and use the Scale tool if the model looks too big or too small. |
| Orientation | Adapted | glTF is Y-up, right-handed and FBX is Y-up by default, but exporters can change it. The converter writes a consistent orientation, but verify the up axis in your target software. |
Expect the FBX file to be roughly 1.7x larger than the glTF source, because FBX is medium, usually larger than GLB when textures are embedded.
Why convert glTF to FBX?
Why leave glTF
People most often convert from glTF when they are inspecting or editing a scene by hand before shipping. Other common cases include repackaging a multi-file glTF into a portable single file and moving a web asset into desktop tools. In glTF → FBX specifically, preserved: geometry, vertex colours, and animation; adapted: materials, textures, units & scale, and orientation. Expect the FBX file to be roughly 1.7x larger than the glTF source, because FBX is medium, usually larger than GLB when textures are embedded.
Why choose FBX
FBX is the right target when you are handing an asset to a game or VFX team. It also fits scenarios such as importing into Unity, Unreal Engine or Maya and keeping skeletons and animation for character pipelines. Taking a web-ready asset into a desktop modelling format is the classic hand-off from publishing back to production.
Where the result opens
After conversion you can open the .fbx file in Unity, Unreal Engine, Maya, 3ds Max or Blender.
Step-by-Step Guide: glTF → FBX
- 1
Upload your .gltf file
Drag your glTF model onto the converter or click to browse. Textures are stored as external image files or data URIs; zip the model with its textures and companion files if you want them included.
- 2
Check your free quota
Free accounts can run a few conversions per day; signing in unlocks tracking of your remaining uses. No watermark is ever added.
- 3
Convert to FBX
Press the Convert to FBX button. The pipeline follows glTF → GLB → FBX (parsed into a GLB scene, then exported as FBX), which usually takes a few seconds for models under 100 MB.
- 4
Download the .fbx file
Your FBX file downloads automatically. Open it in Unity and Unreal Engine to confirm scale and orientation.
Tips for glTF → FBX
- Relative paths to .bin and texture files break when the files are separated (glTF source).
- Centimeter units make models 100x too large or small in meter-based tools (FBX target).
- Always verify real-world size: glTF is meters (fixed by the glTF specification), while FBX is centimeters by default, with a settable unit scale.
Frequently Asked Questions
How do I convert glTF to FBX without losing quality?
Upload the .gltf file and press convert; the route is glTF → GLB → FBX (parsed into a GLB scene, then exported as FBX). Geometry is carried over exactly; materials are mapped to the closest FBX equivalent, and textures stay linked through UV coordinates.
Does glTF to FBX conversion keep textures?
In glTF, textures are stored as external image files or data URIs. In FBX, textures may be embedded or referenced externally depending on the exporter, so texture handling is reduced to what the target supports.
Why does my FBX model look the wrong size or rotation?
glTF uses meters (fixed by the glTF specification); FBX uses centimeters by default, with a settable unit scale. Check the scale in your target application, and use the Scale tool if the model looks too big or too small. glTF is Y-up, right-handed and FBX is Y-up by default, but exporters can change it. The converter writes a consistent orientation, but verify the up axis in your target software.
Will the FBX file be bigger or smaller than my glTF file?
Expect the FBX file to be roughly 1.7x larger than the glTF source, because FBX is medium, usually larger than GLB when textures are embedded.
What software can open the converted FBX file?
FBX files open in Unity, Unreal Engine, Maya, 3ds Max or Blender. If you need to go back, use the FBX to glTF converter.
Is it safe to upload my glTF model?
Yes. Files are processed in your browser or on isolated instances and purged right after conversion. They are never used to train AI models, and no watermark is added.