How do I convert an OBJ file to FBX?

Drop the .obj into the converter above; the binary .fbx downloads in seconds, written locally in your browser via a WebAssembly build of assimp - no account or install.

Do materials and textures come along?

No - OBJ keeps materials in a sidecar .mtl file plus texture images, which are not part of the single file you drop. The mesh arrives with UVs intact, so assigning materials in Unity, Unreal, or Maya is quick.

Why does my model import at the wrong size?

OBJ carries no units and FBX tools commonly assume centimeters. Coordinates copy 1:1, so a meter-based model can import 100x small - fix it with the import scale factor in your target application.

Is my file uploaded anywhere?

No - the entire conversion, including FBX writing, happens in your browser.

Can I convert an OBJ with multiple objects?

Yes - each OBJ group becomes a mesh in the FBX scene, and their relative positions are preserved.

OBJ vs FBX - when is each the right format?

OBJ is the universal static-mesh interchange: plain text, readable by everything, no rigging. FBX is the game/DCC scene format: binary, Autodesk-native, carries rigs and animation (when authored in a DCC tool). Convert OBJ to FBX when a pipeline demands FBX; otherwise OBJ travels further.

Convert OBJ to FBX - Free Online Converter

Drop a .obj file below and download it as .fbx in seconds. The conversion runs entirely in your browser - no upload, no signup, no watermark. The output is a binary FBX ready for Unity, Unreal, Maya, and 3ds Max.

Updated July 2026

Done in seconds

Your OBJ converts to FBX locally in your browser - no upload queue, no waiting.

Private by design

Your file never leaves your device. Nothing is uploaded, nothing is stored.

Free, no strings

No signup, no watermark, no file limit - convert as many files as you need.

How to convert obj to fbx

Drop your OBJ file

Drag the .obj file into the converter above or click to browse. No account and no upload - the file stays on your device.

Conversion runs in your browser

The model is parsed and rewritten locally, in seconds for typical files. Geometry is carried over 1:1 - no remeshing, no quality loss.

Download the FBX

The .fbx download starts from the same spot. Convert as many files as you like - there is no limit or watermark.

OBJ and FBX, explained

.obj

What is OBJ?

OBJ is the plain-text workhorse of 3D interchange. It stores vertices, faces, UV coordinates, and normals in a human-readable file, with materials referenced from a companion .mtl file. Practically every 3D application of the last 30 years can read it.

Because OBJ splits materials and textures into separate files, a bare .obj carries geometry and UVs but shows up untextured unless the .mtl and texture images travel with it. It has no units, no rigging, and no animation - which keeps it simple and universally compatible.

Developed by: Wavefront Technologies (circa 1990)
Structure: Plain-text geometry, with materials in a separate .mtl file
Used by: Blender, Maya, 3ds Max, ZBrush, game engines, 3D scanners

.fbx

What is FBX?

FBX is Autodesk's proprietary scene format and the long-standing standard for moving rigged, animated characters between DCC tools and game engines. Skeletons, skinning, blend shapes, and animation clips all travel inside one file.

Because the format is closed, no official browser tooling exists - this fleet writes FBX through assimp's open-source FBX writer running as WebAssembly, right in your browser. Static geometry with UVs is the reliable path; rigs and animation clips need a DCC-tool export.

Developed by: Autodesk (proprietary) (2006 (Autodesk era))
Structure: Proprietary binary scene container
Used by: Unity, Unreal Engine, Maya, 3ds Max, MotionBuilder

What survives the obj to fbx conversion

Format conversion is honest work: some data has nowhere to go in the target format. Here is exactly what carries over.

Mesh geometry

All faces carry over exactly, triangulated the standard way.

UV coordinates & normals

UVs and normals survive into the FBX for correct texturing and shading downstream.

Materials (.mtl)

OBJ materials live in a separate .mtl plus image files that are not part of the single file you drop - assign materials in the target tool.

Model scale

OBJ is unitless; FBX consumers commonly assume centimeters. Numbers copy 1:1 - set the import scale in your engine if needed.

Object groups

Groups carry as separate meshes in the FBX scene; names may simplify.

When should you convert OBJ to FBX?

Convert to FBX for Autodesk-centric pipelines: Maya and 3ds Max import FBX natively, many engine toolchains and asset stores expect it, and some plugins refuse OBJ outright.

Keep the OBJ for sculpting apps, CAD tools, renderers, and scripts - its plain-text universality is the point. For modern engines, consider OBJ to GLB instead; glTF is the better-supported target.

Still weighing the formats themselves? See the full FBX vs OBJ comparison - structure, materials, file size, and which wins for each use case.

And if what you actually need is a new model rather than a new file format: 3D AI Studio's main tool can generate 3D models from photos with AI - with exports to every format on this page.

OBJ to FBX - frequently asked questions

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