Turn STL 3D models into OFF. It is converted in your browser, so the file never leaves your device.
Drop STL files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · several at once0 bytes uploaded, ever
Drop STL 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 OFF, or download everything as one ZIP if you converted several files.
The STL to OFF 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.
STL has no colour, no units and no texture, and it is large for detailed models. OFF is a short, readable text file that geometry libraries and research code read directly. STL is at home in 3D printing; OFF is the usual choice for simple polygon meshes in research code and shape datasets.
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. Models up to 3,000,000 triangles are accepted.
STL 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 converterOFF 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 converter| STLSTL 3D model | OFFOFF 3D model | |
|---|---|---|
| Stands for | Stereolithography file | Object File Format |
| Type | 3D model | 3D model |
| Compression | None | None (text) |
| Introduced | 1987, by 3D Systems | The early 1990s, by the Geometry Center, University of Minnesota (for Geomview) |
| Opens in | Every slicer and 3D printing program, CAD tools and Windows 3D Viewer | MeshLab, Geomview, CGAL, trimesh and most geometry-processing tools |
| Best for | 3D printing | Simple polygon meshes in research code and shape datasets |
| File extension | .stl | .off |
No. The STL to OFF 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: OFF 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 STL file, press Convert and save the OFF. 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.