STL to OBJ Converter
Convert Stereolithography (STL) to Wavefront OBJ (OBJ) online for free. Runs 100% in your browser. Files never leave your device. No signup, no watermarks, no limits.
Drag & drop files here, or browse
Processed on your device. Nothing is uploaded
Automate this. An open tab can convert whole folders via the Local API - still zero uploads.
Local API →How to use STL to OBJ Converter
- 01Add files
Choose files or drop them here
- 02Settings
Settings · Runs on your device
- 03Download
Processed on your device. Nothing is uploaded
What is a STL (Stereolithography) file?
STL is the standard mesh format for 3D printing. A raw list of triangles describing a solid's surface. Nearly every slicer and CAD tool accepts it.
- Developed by
- 3D Systems
- Initial release
- 1987
What is a OBJ (Wavefront OBJ) file?
OBJ is a simple, open 3D geometry format storing vertices, faces, UVs and normals. It is the most portable interchange format between 3D applications.
- Developed by
- Wavefront Technologies
- Initial release
- 1990
Frequently asked questions
How do I convert STL to OBJ?
Click “Choose Files” or drag your STL file onto the page, optionally adjust the settings, then hit Convert. Your OBJ file downloads straight from your browser. Nothing is uploaded anywhere.
Is this STL to OBJ converter free?
Yes, completely free with no hidden limits, watermarks or signup. Because all processing happens on your own device, there are no server costs to pass on to you.
Are my files uploaded to a server?
No. The conversion engine runs entirely in your web browser using WebAssembly. Your files never leave your device. You can even disconnect from the internet after the page loads and keep converting.
Is there a file size limit?
We impose no fixed limit. The practical ceiling is your device's free memory, since processing happens locally. Most conversions work comfortably with files up to a few hundred megabytes, and image or document conversions handle much more.
Does it work on my phone?
Yes. The converter runs in any modern browser on Windows, macOS, Linux, Android and iOS. No app installation is required.