OFF Converter
FileFlip converts OFF files into 14 other formats entirely inside your browser, using Assimp compiled to WebAssembly. The OFF file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. There is no file-size limit and no account to create.
How do I convert an OFF file?#
- Drop your OFF file onto the converter at the top of this page, or click it to pick one from your computer.
- Choose the format you want out of it. FileFlip downloads the engine that conversion needs, once, and your browser caches it.
- Conversion starts the moment you pick the format, and the result is yours to download. The work happens in this tab, so nothing is uploaded and nothing is queued.
Is it safe to convert OFF files online?#
Yes, because nothing is uploaded. FileFlip converts OFF files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What happens to a OFF file#
FileFlip converts OFF into 14 formats with Assimp, all of it inside the browser tab. Each conversion below names the engine it uses, what it downloads, and exactly what that conversion keeps or drops.
| Category | 3D Models |
|---|---|
| File extension | .off |
| FileFlip support | Read only, so it is a source rather than a target |
| Conversions available | 14 |
| Engines | Assimp |
| Downloaded to your browser | 11.2 MB on the first conversion, then cached |
What is an OFF file?#
An OFF file is plain text written for the Geomview viewer built at the University of Minnesota's Geometry Center, starting with the word OFF and a line giving the vertex and face counts before listing each vertex's coordinates and each face's vertex indices in order.
Use OFF when a mesh needs to move between computational geometry tools or research code that already expects the format.
Convert OFF to OBJ or STL when the mesh needs to open in mainstream 3D software, since OFF support outside academic tools is limited.
The OFF file format reference covers the specification, the programs that open one, and what each conversion keeps or drops.
OFF questions people ask#
What is an OFF file?
An OFF file is a minimal 3D mesh format: a vertex count, a face count, a list of vertex coordinates and a list of faces given as vertex indices, with nothing else. It comes from Geomview, the visualisation tool built at the University of Minnesota's Geometry Center, and shows up throughout computational geometry research and teaching material.
What software opens OFF files?
MeshLab and Geomview both open OFF files directly, and most computational geometry libraries such as CGAL can read and write it. Outside of research and mesh-processing tools, general-purpose 3D software rarely supports it natively.
Does an OFF file support color?
Yes, an OFF file can carry an optional RGBA colour value on each vertex or each face, appended right after its coordinates or indices. It's the one piece of surface information the format supports beyond raw geometry.