STL to OBJ Converter
Processing entirely on your device — large files may take a moment.
STL 3D Model and Wavefront OBJ Model exist for different jobs: STL is the workhorse format of 3D printing: a plain list of triangles describing the model surface, understood by every slicer and CAD tool. OBJ opens in Blender, Maya, 3ds Max, SketchUp and countless model viewers — the safest interchange format for meshes.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How to convert STL to OBJ
- 1
Select your files
Drag & drop your STL files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to OBJ". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted OBJ file individually, or grab everything at once as a ZIP archive.
Frequently asked questions
Is this STL to OBJ converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
What happens to colors and materials?
The OBJ format only stores geometry, so colors, textures and materials from the source file are dropped — the shape converts perfectly, appearance does not. If you need materials, convert to GLB instead.