Convert OFF to FBX Online
Turns an OFF (Object File Format) mesh into a binary FBX that Unity, Unreal, Maya, 3ds Max and Blender can import. Two honest caveats first: the result is plain untextured geometry, and it arrives rotated 90 degrees about X, so you will need to set the X rotation to -90 after importing.
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Why OFF needs converting at all
OFF is a deliberately minimal format from the geometry-processing world, originally from Geomview and still common in research datasets and academic toolchains: a header line, counts of vertices and faces, then the vertex coordinates and the face index lists. MeshLab, CloudCompare, CGAL-based tools and various university codebases read it directly. Engines and animation packages generally do not, which is why a ModelNet sample or a lab export has to become an FBX before it can be used in Unity, Unreal, Maya or 3ds Max.
The conversion runs on our servers in two stages. First a Python reader built on trimesh loads the OFF file, merges what it finds into a single mesh and recomputes face normals so the surface shades consistently; it writes that out as an intermediate glTF binary. Then Blender 5.1.2 opens the intermediate file and exports binary FBX 7400 with textures set to embed. Each stage has its own 600-second limit, so very large research meshes can be refused rather than finished.
Vertex positions and face topology come through, with polygonal faces split into triangles because the intermediate stage stores triangles. Everything else is not carried: the color variants of the format are not reproduced, and there are no materials, UVs, smoothing groups, object names or hierarchy in the result, so the FBX holds one merged, untextured mesh. Two numbers need checking after import. The OFF data is treated as Z-up while FBX is a Y-up format and nothing in this chain rotates the axes, so the model lands on its back. And OFF carries no unit at all, so the raw coordinates are written through and FBX labels them as meters: a mesh normalized to a unit bounding box imports as a one-meter object, and a millimeter-scale scan imports enormous.
How to convert OFF to FBX
- Make sure the file is a text OFF with the OFF keyword on the first line, followed by the vertex, face and edge counts and then the vertex and face lists. Unreadable or truncated files come back as "Could not read this 3D file"; re-save from MeshLab or CloudCompare if that happens.
- Drop the OFF file on this page. It is free with no sign-up up to 50 MB per file, 100 MB with a free account, and a batch holds 10 files (25 on Plus, 50 on Pro).
- The two-stage conversion runs on our servers: the trimesh reader produces an intermediate mesh, then Blender writes the FBX. Nothing happens in your browser.
- Download the .fbx file. The link is valid for about four hours, after which the output is deleted.
- Import it into Unity, Unreal, Maya, 3ds Max or Blender, set the X rotation to -90 degrees to stand the model up, and rescale it against something known in your scene.
What the converter does with an OFF file
- Loads the OFF mesh with trimesh and recomputes face normals, which cleans up the inconsistent winding common in research and scanned meshes.
- Exports binary FBX 7400 through Blender, the variant that Unity, Unreal, Maya, 3ds Max and Blender all import without a plug-in.
- Merges all geometry in the file into one mesh object, so you get a single predictable node rather than scattered fragments.
- Delivers one self-contained .fbx file with no sidecars, because there are no textures or materials in the output to carry.
- A conversion that ends up with no usable geometry fails with an error at the mesh stage instead of running to completion.
- Accepts up to 10 files per request, each converted as its own job with its own download link.
Video Tutorial
OFF → FBX in seconds! Free online converter at MiConvert.com 🔗 https://miconvert.com/en/off-to-fbx?utm_source=youtube&utm_medium=social&utm_campaign=off-to-fbx Quick steps: Upload → Convert → Downl
OFF to FBX questions
Why does my model lie on its back after importing?
OFF data is read as Z-up and FBX expects Y-up, and this conversion path writes the coordinates through without an axis change, so the model comes in rotated 90 degrees about X. Set the imported object's X rotation to -90 degrees, or rotate it once and re-save the asset in your engine or DCC tool.
Will colors from a COFF-style file survive?
No. Some OFF files list per-vertex or per-face colors, but the FBX produced here contains geometry only. If colour matters, plan on assigning materials yourself after import: our OFF reader loads geometry, and colour lists in the file are not carried into the FBX.
What size will the model be in Unity or Maya?
Whatever the raw OFF numbers say, interpreted as meters. OFF has no unit field and nothing in the chain scales anything, so a mesh normalized to a 1-unit box becomes a 1-meter object and a scan in millimeter numbers becomes kilometers wide. Scale the object after import.
Does the FBX keep quads, or is everything triangulated?
Everything is triangulated. The intermediate stage of the pipeline stores triangle meshes, so polygonal faces in the OFF are split before the FBX is written. If quad topology matters for your workflow, retopologize in Blender or Maya after importing.
Can an OFF file bring a rig or animation into FBX?
No. OFF stores static geometry only, so there is no skeleton, no skin weights and no animation to transfer. FBX supports all of those, which means you can rig and animate the mesh once it is in Blender, Maya or 3ds Max.
Would OBJ or STL be a better target than FBX?
It depends on the destination. For 3D printing or mesh repair, OFF to STL is simpler and the output keeps the source orientation, as STL is Z-up like the OFF data. Choose FBX when the receiving tool specifically asks for it, as game engines and Autodesk software usually do.
Which programs can open an OFF file directly, if I just want to look at it?
MeshLab, CloudCompare and Geomview read OFF natively, and many CGAL and academic geometry tools use it as their standard format. Those are also the easiest places to re-export a broken OFF file before uploading it here.
What happens to the file I upload?
It travels over HTTPS, is converted by processes on our servers, and is deleted as soon as the job ends. The FBX sits behind a random download link for roughly four hours and is then deleted automatically. File names, sizes and conversion outcomes appear in our logs, and signed-in users keep a history entry.