Turn OFF 3D models into STL. It is converted in your browser, so the file never leaves your device.
Drop OFF files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · several at once0 bytes uploaded, ever
Drop OFF files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
Press Convert. There is nothing else to set. The work happens in this tab.
Save the STL, or download everything as one ZIP if you converted several files.
The OFF to STL converter is part of this page and runs inside your browser. Your 3D models are never sent to ToAny or to anyone else.
Nothing has to travel to a server and back, so the conversion starts the moment you press Convert, even on a slow connection.
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
OFF has no materials, textures or units, and few 3D modelling or printing programs open it. STL is accepted by every 3D printer and slicer. OFF is at home in simple polygon meshes in research code and shape datasets; STL is the usual choice for 3D printing.
The model is converted as triangles: lines and points are dropped, positions are used as they are, and no axis conversion is applied, so a model that is Y-up in glTF and Z-up in STL, OBJ and PLY is written exactly as it was read. STL stores geometry only, so vertex colours and materials are dropped. Models up to 3,000,000 triangles are accepted.
OFF lists a mesh as plain text: a header with the vertex and face counts, one line per vertex, then one line per polygon giving its corner count and vertex indices. Variants add vertex colours (COFF) or normals (NOFF). Its simplicity made it the format of shape benchmarks such as Princeton's and ModelNet.
Opens in MeshLab, Geomview, CGAL, trimesh and most geometry-processing tools
OFF converterSTL describes a surface as a list of triangles and nothing else: no colour, no materials, no units. That simplicity made it the standard input of 3D printers and slicing software. It exists as binary and as text; the binary one is much smaller.
Opens in Every slicer and 3D printing program, CAD tools and Windows 3D Viewer
STL converter| OFFOFF 3D model | STLSTL 3D model | |
|---|---|---|
| Stands for | Object File Format | Stereolithography file |
| Type | 3D model | 3D model |
| Compression | None (text) | None |
| Introduced | The early 1990s, by the Geometry Center, University of Minnesota (for Geomview) | 1987, by 3D Systems |
| Opens in | MeshLab, Geomview, CGAL, trimesh and most geometry-processing tools | Every slicer and 3D printing program, CAD tools and Windows 3D Viewer |
| Best for | Simple polygon meshes in research code and shape datasets | 3D printing |
| File extension | .off | .stl |
No. The OFF to STL conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
No further quality is lost: STL stores the decoded audio exactly. The result is identical in content.
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the OFF file, press Convert and save the STL. There is nothing to install.
Yes. Models up to 150 MB and 3,000,000 triangles are accepted; a larger one is refused with a message. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.