Convert STL to OBJ
Convert STL files to OBJ locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
Upload FilesPlatform Statistics
How to convert STL to OBJ
- Drop your .stl files above, or click Upload Files. You can add many files at once.
- OBJ is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. Assimp and three.js runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .obj files as soon as each one finishes.
What to know about STL to OBJ conversion
- The OBJ file contains the full geometry with normals and UVs; materials are not exported as a separate .mtl file.
STL vs OBJ
| Feature | STL (Stereolithography) | OBJ (Wavefront OBJ) |
|---|---|---|
| Materials and textures | No | Yes |
| Animation and rigging | No | No |
| Best for | 3D printing and CAD workflows | static meshes that open in every 3D tool |
| Opens in | Cura, PrusaSlicer, Bambu Studio and CAD software | every 3D modeling application |
STL (Stereolithography): The standard mesh format for 3D printing and CAD, storing triangulated surfaces.
OBJ (Wavefront OBJ): A simple, universally supported text-based 3D geometry format.
Conversion options
- Custom output file name
Frequently asked questions
Is it safe to convert STL to OBJ here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several STL files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert OBJ to STL.
Convert STL to other formats
Convert other formats to OBJ
See every STL converter and OBJ converter, or browse the full converter directory.