Convert OBJ to STL
Convert OBJ files to STL 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)
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How to convert OBJ to STL
- Drop your .obj files above, or click Upload Files. You can add many files at once.
- STL 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 .stl files as soon as each one finishes.
What to know about OBJ to STL conversion
- STL stores geometry only, so materials, textures and animation are not included in the output.
- Binary STL is used: it is smaller than ASCII STL and accepted by every slicer.
OBJ vs STL
| Feature | OBJ (Wavefront OBJ) | STL (Stereolithography) |
|---|---|---|
| Materials and textures | Yes | No |
| Animation and rigging | No | No |
| Best for | static meshes that open in every 3D tool | 3D printing and CAD workflows |
| Opens in | every 3D modeling application | Cura, PrusaSlicer, Bambu Studio and CAD software |
OBJ (Wavefront OBJ): A simple, universally supported text-based 3D geometry format.
STL (Stereolithography): The standard mesh format for 3D printing and CAD, storing triangulated surfaces.
Conversion options
- Custom output file name
Frequently asked questions
Is it safe to convert OBJ to STL 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 OBJ 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 STL to OBJ.
Convert OBJ to other formats
Convert other formats to STL
See every OBJ converter and STL converter, or browse the full converter directory.