Convert OBJ to STL Online
Convert your OBJ 3D models to STL format for 3D printing directly in your browser. No software to install, no account to create. Your files are processed locally and never leave your device.
Convert OBJ to STL
Your file is processed entirely on your device. Nothing is uploaded to any server.
How to Convert OBJ to STL
- Choose your OBJ file — Drop it onto the box above, or click to browse. The file is read directly from your device and never uploaded.
- Wait a moment — Your OBJ file is parsed and rewritten as STL in this browser tab. Most models finish in a second or two.
- Save the STL — The converted file downloads automatically, keeping the original name with a .stl extension.
- Open it anywhere — The result works in Cura, PrusaSlicer, Bambu Studio and every mainstream 3D-printing slicer.
Features
Client-Side Conversion
The entire conversion happens in your browser using WebGL and Three.js. Your OBJ file is parsed, rendered in 3D, and exported as STL. No server involved.
3D Print Ready
The exported STL file is compatible with all major 3D printing slicers including Cura, PrusaSlicer, and Simplify3D.
Preserves Geometry
All mesh geometry, vertices, and faces from your OBJ file are preserved in the STL output. The triangulation is handled automatically.
Works Offline
Once the page loads, the converter works entirely offline. Your files never leave your device, ensuring complete privacy.
Frequently Asked Questions
Why convert OBJ to STL?
STL is the standard format for 3D printing. Most slicing software requires STL input. Converting OBJ to STL lets you prepare models from 3D modeling software for printing.
Are materials and textures preserved?
STL format does not support materials or textures — it stores only geometry. If your OBJ has materials, the geometry is preserved but material data is not included in the STL output.
Does it handle large OBJ files?
Yes. The converter handles files of any size, limited only by your device's available memory. Most OBJ files convert in a few seconds.
Can I convert STL back to OBJ?
Yes. You can also convert STL to OBJ using our converter.
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Open, view, and convert OBJ to STL in seconds. No installation needed.
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