Convert OFF to GLB
Free OFF to GLB converter that runs in your browser. See real dimensions before you download.
How to convert OFF to GLB
- Drop your OFF file onto the converter — it opens in your browser, nothing is uploaded.
- Check the preview and the dimensions in mm; fix units or the up axis in “Units & orientation” if the size or orientation looks wrong.
- Choose GLB as the output and click Convert. Several files download as one ZIP.
What carries over from OFF to GLB
| OFF | GLB | Result | |
|---|---|---|---|
| Colour / materials | No | Yes | — |
| Textures | No | Yes | — |
| Units stored in file | No | Yes | Written as mm → metres |
| Separate parts | No | Yes | — |
| Usual up axis | Z | Y | Rotated (switchable) |
About OFF files
OFF, the Object File Format, was defined for Geomview, an interactive geometry viewer developed at the Geometry Center at the University of Minnesota in the 1990s. A file is plain text. The first line holds the keyword OFF, the second gives the counts of vertices, faces and edges, then each vertex appears as three coordinates and each face as a vertex count followed by index numbers. Variants add colour (COFF), normals (NOFF) or texture coordinates (STOFF) through prefixes, and colour is optional at the end of each line. The simplicity made it a favourite in computational geometry, and benchmark sets such as ModelNet used it for machine-learning research on shape classification. CGAL and libigl read and write it directly. It has no units, materials or scene structure, so it is rarely a printing format, but converting it is common.
About GLB files
GLB is the binary container for glTF 2.0, the format the Khronos Group describes as the JPEG of 3D. One .glb file bundles a JSON scene description, binary mesh buffers and embedded images, so nothing can go missing in transit. The format was designed for efficient delivery and loading on the web, and it is now used by Three.js, Babylon.js, model-viewer, Google Search 3D results, Meta platforms, Unity and Unreal importers, and many marketplaces such as Sketchfab. glTF defines a physically based metallic-roughness material model, a node hierarchy, cameras, skins and animations. Coordinates are in metres with +Y up and a right-handed system. It is excellent for display and game assets, but it is a presentation format rather than a manufacturing one, so print workflows usually convert it first.
3D printing notes
Few slicers open OFF directly, so the usual job is converting a research or dataset mesh into STL or 3MF. Dataset meshes such as those in ModelNet are often unit-less, normalised to a small box and not designed for printing, so they can be scaled to a size of one unit and have thin shells or holes. Set the printed size deliberately, then run a repair. MeshShift reads and writes OFF in the browser, shows real dimensions, lets you rescale, and converts to STL, 3MF, OBJ, GLB or PLY. Its print check finds holes and flipped normals and can rebuild a closed solid at the same size before you slice.
Frequently asked questions
Is this OFF to GLB converter free and private?
Yes. The conversion runs in your browser with JavaScript and WebAssembly, so your OFF file is never uploaded to a server. There is no sign-up, no watermark and no daily limit; very large files are limited only by your device's memory.
What is an OFF file used for?
OFF is a simple mesh format used mainly in geometry processing and machine-learning research. Datasets like ModelNet ship as OFF because the format is easy to parse. It is a plain text list of vertices and faces.
What is the difference between GLB and glTF?
They describe the same scene. glTF is usually a JSON file with separate .bin and image files, while GLB packs everything into one binary file. GLB is easier to share and upload, glTF is easier to inspect and edit by hand.