FORMAT COMPARISON
OBJ vs FBX
The open mesh file and Autodesk's scene format — what each carries, who actually opens them, and which one belongs in your pipeline.
The short answer
Use OBJ for scans, print-bound static meshes, and any exchange where you cannot assume Autodesk tools on the other end. It is an open text format: geometry, UVs, normals, optional MTL — no animation, human-readable. Use FBX when the file is a game or animation asset: Maya, 3ds Max, Unity, Unreal and Mixamo all speak it, and it can hold a skeleton, clips, blendshapes and a fuller material graph. OBJ is the lowest common denominator. FBX is the production container.
Feature comparison
OBJ is a mesh. FBX is a scene. That is the whole distinction. One stores the shape; the other stores the shape plus the rig, the timeline, and the materials a DCC already assigned.
| Feature | OBJ | FBX |
|---|---|---|
| File structure | Plain text (v / vt / vn / f) + optional MTL | Binary or ASCII scene graph |
| Geometry | Indexed faces (tri / quad / n-gon) | Meshes, plus hierarchy and transforms |
| UV coordinates | Yes (vt) | Yes |
| Materials | MTL sidecar + external image maps | Embedded or referenced; richer graph |
| Animation | No | Yes — clips, keyframes, a timeline |
| Skeleton / skinning | No | Yes — bones and skin weights |
| Blendshapes / morphs | No | Yes |
| Human-readable | Yes — edit in a text editor | ASCII FBX is text; binary is not |
| Open spec | Yes (de facto Wavefront) | No — Autodesk proprietary |
| Typical use | Scan, print prep, static interchange | Games, film, DCC ↔ engine |
| First released | 1980s (Wavefront) | 1996 (Kaydara; Autodesk since 2006) |
| Who reads it everywhere | CAD, scanners, editors, archives | Maya, Max, Blender, Unity, Unreal |
Where each wins
OBJ wins on openness and reach. You can read the file in a text editor, diff it, and hand it to a tool that has never heard of Autodesk. Photogrammetry and print-adjacent workflows still default to it. The limitation is the feature list: no animation, no bones, materials in a sidecar that is easy to leave behind.
FBX wins inside a game or film pipeline. One file can carry the character, the rig, the clips and the materials Unity or Unreal expect. The limitation is lock-in and weight: proprietary container, larger files, and a long list of CAD and scan tools that still do not import it cleanly. If the other end is a slicer, neither format is the destination — convert to STL.
When to use OBJ
- Photogrammetry and 3D-scan exports headed to an editor or a print conversion
- Static mesh interchange with CAD, sculpting, or older packages
- When you need a file a human can open in a text editor
- When you cannot assume the other end has an FBX importer
When to use FBX
- Maya / 3ds Max / Blender → Unity or Unreal character pipelines
- Mixamo, motion-capture, or any asset that includes a skeleton and clips
- Blendshapes and facial animation that OBJ cannot store
- When the destination DCC or engine lists FBX as the native import
Converting between them
FBX → OBJ extracts geometry and UVs and drops bones, clips and embedded maps. There is no lossless OBJ → FBX on this site because OBJ has no animation to restore. If the FBX is headed for a printer, skip OBJ and use FBX → STL. An OBJ that is already static can go to print via OBJ → STL.
For the mesh format itself, see What is an OBJ file.
FAQ
Is FBX better than OBJ?+
For animation and game pipelines, yes — FBX carries bones, clips, blendshapes and a richer material graph. For a static mesh you need to open everywhere, OBJ is the safer bet: it is an open text format that CAD, scanners and older tools still read. Pick the job, not a winner.
Does OBJ support animation?+
No. Wavefront OBJ is vertices, faces, UVs, normals and an optional MTL file. There are no bones, no morph targets, no timeline. If you need a posed frame, pose it in the DCC and export a still mesh. For clips and a skeleton, use FBX or glTF.
Is FBX an open format?+
No. FBX is Autodesk's proprietary format. The file can be binary or ASCII, but the spec is not a public standard you implement from a one-page document. Unity, Unreal, Maya, 3ds Max and Blender speak it because Autodesk's SDK and community loaders exist — not because it is an ISO format. OBJ is the open, readable one.
Which should I send to a 3D printer?+
Neither is the print format. Convert to STL (or 3MF) first. OBJ is closer to a print mesh than FBX is — it is already static geometry — but slicers want triangles without UVs or MTL. Use OBJ to STL or FBX to STL on this site rather than dropping either file on the plate.
Can I convert FBX to OBJ without losing the mesh?+
Geometry and UVs survive. Skeleton, skin weights, animation clips, blendshapes and embedded textures do not — OBJ has nowhere to put them. The mesh is written in the rest or bind pose. That is expected, not a bug.