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
Converting OFF files to STL format is simple with PrivConvert. Our free online converter handles the entire process in your browser with no software installation required. Your files are processed securely in memory and never stored on our servers.
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 Choose PrivConvert?
Unlike other online converters that upload your files to remote servers, store them for days, and may use them for AI training or sell your data, PrivConvert was built with privacy as the foundation. Here's what makes us different:
Files are processed in volatile memory (RAM) and immediately purged. Nothing is ever written to disk or backed up.
All uploads and downloads are encrypted with TLS 1.3. Your files cannot be intercepted in transit.
Use any tool instantly without signing up, providing an email, or creating a profile. No tracking cookies, no user profiling.
Compatible with Windows, macOS, Linux, iOS, and Android. No plugins or desktop software needed - just a modern web browser.
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 | |
Trusted by Thousands of Users
PrivConvert processes thousands of file conversions every day. Our commitment to privacy and security has made us the go-to choice for professionals, developers, and privacy-conscious users worldwide.