Convert OFF to STL
Free, in your browser, with nothing uploaded. Drop your .off file in and take the .stl away.
Drop your OFF file here
.off in, .stl out
Choose filesNothing is uploaded No account, no email No file size limit
How to convert OFF to STL
- 01
Add your .off file
Drag your Object File Format file onto the drop zone, or click it to browse. Nothing is uploaded: it is read where it already sits.
- 02
Check the preview
The model is parsed on your machine and drawn in the viewport, so a wrong axis or a missing texture shows up before you commit rather than downstream.
- 03
Save the .stl file
Press convert. The Stereolithography file is written in the tab and lands in your downloads folder. No link, no expiry, no account.
What carries over, and what does not
A format conversion is a translation, and translations lose things. Here is what actually happens when an OFF file becomes an STL file.
| Data | OFF | STL | Survives |
|---|---|---|---|
| Geometry | Yes | Yes | Yes |
| Materials & colour | No | No | n/a |
| Texture maps | No | No | n/a |
| Animation & rigs | No | No | n/a |
| Scene hierarchy | No | No | n/a |
This is a comparatively lossless pairing: 1 of the five categories above are supported by both formats, so most of what is in your OFF file has somewhere to go in the STL file.
About Object File Format
OFF is about as simple as a mesh format gets: the word OFF, three counts, a list of vertices, and a list of faces indexing them. It comes out of Princeton’s Shape Benchmark and the geometry-processing world, which is where you still meet it: segmentation datasets, computational geometry papers and course assignments almost always ship OFF.
Commonly seen in: Princeton Shape Benchmark, MeshLab, CGAL, Geomview, academic datasets. More on the OFF format page.
About Stereolithography
STL describes a solid as an unstructured soup of triangles, each with a normal and three corners, and nothing else. No colour, no texture coordinates, no units, no scene graph, which is exactly why every slicer and every 3D printer on the market accepts it. Converting to STL flattens your scene into a single watertight-ish mesh and throws the materials away; that loss is intentional, not a bug.
Commonly seen in: Cura, PrusaSlicer, Bambu Studio, Fusion 360, SolidWorks, Meshmixer. More on the STL format page.
How the conversion works
When you drop a file in, the bytes are handed to a parser compiled to run in your browser. The OFF data is decoded into an in-memory scene graph of meshes, materials and transforms, which is what the preview is drawing. Pressing convert walks that scene graph back out through a STL writer and hands you the resulting bytes as a download.
The whole round trip is local. The page itself is static: it is delivered once and then does its work offline. That is why the privacy claim is checkable rather than a promise.
OFF to STL: common questions
Is my OFF file uploaded anywhere?
No. The file is read by code running inside this browser tab and never crosses the network. You can prove it by disconnecting from the internet before you convert, the page keeps working, or by watching the Network tab in your browser's developer tools while you drop a file in.
How large an OFF file can I convert?
There is no server-side limit because there is no server. The practical ceiling is your own machine's memory: a browser tab can usually handle models up to a few hundred megabytes. Very dense scans or scenes with millions of triangles will take a few seconds and a lot of RAM.
Why does my converted STL file look untextured?
STL stores geometry only; it has no way to record materials or texture maps. If you need the surfacing to survive, convert to GLB or glTF instead.
Does it cost anything?
No. There is no fee, no account, no watermark and no per-file limit. Since the conversion runs on your hardware rather than ours, serving this page costs about as much as serving a blog post.
Does it work on a Mac, on Windows or on a phone?
All of them. There is nothing to install: any browser with WebGL 2 will do, which covers current Chrome, Edge, Firefox and Safari on desktop, and Safari and Chrome on mobile. A phone has less memory than a laptop, so a very heavy scene may be the one thing it cannot finish.
Related conversions
Other things to do with the same file.
From OFF:
Other ways to get to STL:
Or do something else with it: