OFF to STL Converter
Convert an OFF (Object File Format) mesh to STL for 3D printing and universal support.
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About Converting OFF to STL
OFF (Object File Format) is a simple, plain-text mesh format that lists a model’s vertices and faces. It is widely used in academia, geometry-processing research and tools such as MeshLab and CGAL, where a minimal, easy-to-parse mesh format is preferred. When you need to move away from OFF, the usual reason is simple: no colour, texture or material data.
Converting your OFF 3D model to STL solves that. STL is the universal 3D-printing format. It describes a model as a raw triangle mesh — just the surface geometry, with no colour, texture or units. Nearly every slicer and 3D printer accepts it, which is why it is the default export from most CAD tools for printing. In practice you gain understood by virtually every 3d printer and slicer and simple, robust triangle mesh. PrivConvert runs the whole OFF-to-STL conversion in server memory and deletes your file the instant the STL is ready — nothing is stored, logged or reused.
When this conversion helps
- You need understood by virtually every 3D printer and slicer
- You need simple, robust triangle mesh
- You need compact for a plain surface model
- Sharing a OFF 3D model with someone whose software expects STL
Tips for best results
- Files up to 250 MB are supported, and you can batch-convert several OFF files at once; each is processed privately and deleted immediately.
How to Convert OFF to STL Online
You can convert OFF to STL right in your browser in under a minute. What you gain with STL: understood by virtually every 3D printer and slicer.
Drag and drop your file into the upload area, click to browse your device, or paste a URL to a file hosted online. You can upload files up to 250 MB and batch convert up to 20 files at once.
Once uploaded, the conversion from OFF to STL starts automatically. The process runs entirely in an isolated environment - your data never leaves the secure pipeline.
Your converted file is ready instantly. Click the download button to save it to your device. The file is deleted from memory immediately after download.
Why convert OFF to STL with PrivConvert?
PrivConvert turns your OFF into STL without ever storing, logging or sharing it. Here is what that looks like in practice:
Files are processed in volatile memory (RAM) and purged the instant your download is ready — nothing is ever written to disk, cached or backed up.
Every upload and download is protected with TLS 1.3, so your 3D model cannot be intercepted on the way to the server or back to you.
Convert instantly with no sign-up, no email and no profiling cookies. We never build a profile around you or the files you convert.
Runs in any modern browser on Windows, macOS, Linux, Android and iOS — no install, plugin or desktop software needed.
OFF vs STL - Format Comparison
| Feature | OFF | STL |
|---|---|---|
| File extension | .off | .stl |
| Full name | Object File Format | Stereolithography |
| Introduced | 1990s | 1987 |
| Encoding | Text | Binary |
| Editable | No | No |
| Open standard | Yes | Yes |
| Supported by PrivConvert | Yes (as input) | Yes (as output) |
| Privacy-safe conversion | In-memory, zero storage | |
| Max file size | 250 MB per file | |
| Batch support | Up to 20 files simultaneously | |
A converter you do not have to worry about
PrivConvert handles thousands of conversions every day for developers, designers and privacy-conscious people who need a 3D model converted without handing over a permanent copy.