Convert OBJ to FBX Online (Free & Secure)
OBJ to FBX conversion on iLove3DM takes one upload and no account. Your OBJ model, built from polygons (triangles, quads and n-gons) with shared UV and normal pools, is rewritten as FBX with its materials intact.
Select .OBJ file
or drag & drop .obj file here
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⚡ AI Summary & Quick Answer
OBJ to FBX conversion on iLove3DM takes one upload and no account. Your OBJ model, built from polygons (triangles, quads and n-gons) with shared UV and normal pools, is rewritten as FBX with its materials intact.
Both formats are designed for moving assets between modelling packages, so the differences come down to hierarchy, units and animation. OBJ (.obj) is plain ASCII text with a companion .mtl material file. It holds polygons (triangles, quads and n-gons) with shared UV and normal pools and is most often opened in Blender, Maya, and 3ds Max. 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.
The converter parses the OBJ scene graph, normalises meshes and materials, and re-exports them as FBX. Units change from unitless (the importing application decides the scale) to centimeters by default, with a settable unit scale. Everything runs in your browser or an isolated, auto-purged instance, so models stay private.
.objAbout OBJ (Wavefront)
Universal geometry definition format supported by almost every 3D modeling and rendering software.
- Structure: plain ASCII text with a companion .mtl material file
- Materials: Phong-style MTL materials (diffuse, specular, ambient)
- Units: unitless (the importing application decides the scale)
- Axis: conventionally Y-up, but not enforced
- Opens in: Blender, Maya, 3ds Max, ZBrush or MeshLab
.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 OBJ → FBX conversion
Conversion route: OBJ → GLB → FBX (parsed into a GLB scene, then exported as FBX).
| Aspect | Result | Outcome |
|---|---|---|
| Geometry | Preserved | OBJ stores polygons (triangles, quads and n-gons) with shared UV and normal pools; 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 | Preserved | OBJ uses Phong-style MTL materials (diffuse, specular, ambient) and FBX can represent the same information, so base colour and surface settings are preserved. |
| Textures | Preserved | In OBJ, texture images are referenced by file name from the MTL file. FBX can reference or embed textures too, so images and UV mapping stay linked. |
| Vertex colours | Preserved | Per-vertex colours in OBJ are written to FBX as vertex colour data. |
| Animation | Not applicable | OBJ is a static format, so the FBX result is a single static pose. |
| Units & scale | Adapted | OBJ uses unitless (the importing application decides the scale); 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 | OBJ is conventionally Y-up, but not enforced 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 1.9x smaller than the OBJ source, since FBX is medium, usually larger than GLB when textures are embedded.
Why convert OBJ to FBX?
Why leave OBJ
People most often convert from OBJ when they are turning a vendor download into a modern, textured asset. Other common cases include rescuing an old sculpt or archive from a text-based format and moving a model out of ZBrush or Blender into a web pipeline. In OBJ → FBX specifically, preserved: geometry, materials, textures, and vertex colours; adapted: units & scale and orientation. Expect the FBX file to be roughly 1.9x smaller than the OBJ source, since FBX is medium, usually larger than GLB when textures are embedded.
Why choose FBX
FBX is the right target when you are importing into Unity, Unreal Engine or Maya. It also fits scenarios such as keeping skeletons and animation for character pipelines and handing an asset to a game or VFX team. Both formats are designed for moving assets between modelling packages, so the differences come down to hierarchy, units and animation.
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: OBJ → FBX
- 1
Upload your .obj file
Drag your OBJ model onto the converter or click to browse. Texture images are referenced by file name from the MTL file; 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 OBJ → 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 OBJ → FBX
- Missing .mtl or texture files turn a model grey (OBJ source).
- Centimeter units make models 100x too large or small in meter-based tools (FBX target).
- Always verify real-world size: OBJ is unitless (the importing application decides the scale), while FBX is centimeters by default, with a settable unit scale.
Frequently Asked Questions
How do I convert OBJ to FBX without losing quality?
Upload the .obj file and press convert; the route is OBJ → GLB → FBX (parsed into a GLB scene, then exported as FBX). Geometry is carried over exactly; materials are preserved, and textures stay linked through UV coordinates.
Does OBJ to FBX conversion keep textures?
In OBJ, texture images are referenced by file name from the MTL file. FBX can reference or embed textures too, so images and UV mapping stay linked.
Why does my FBX model look the wrong size or rotation?
OBJ uses unitless (the importing application decides the scale); 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. OBJ is conventionally Y-up, but not enforced 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 OBJ file?
Expect the FBX file to be roughly 1.9x smaller than the OBJ source, since 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 OBJ converter.
Is it safe to upload my OBJ 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.