Wavefront OBJ
A simple, very widely supported geometry format, usually paired with an MTL material file.
- Type
- 3D
- Best for
- exchanging models between almost any apps
No account · no upload · no watermark
Convert OBJ to STL. Completely free.
Drop your OBJ and get an STL back, right here in this tab. Your own computer does the work, so nothing gets uploaded, and there's no paid version.
OBJ to STL converter
Stereolithography
The standard format for 3D printing, which stores only the surface triangles.
- Type
- 3D
- Best for
- 3D printing
What to expect
STL stores only the surface, so materials, textures and animation are left out. You can set the up axis and units before exporting, which matters for slicers.
How to convert OBJ to STL
- Drop your OBJ on this page, with any texture and material files.
- STL is already selected. Check the model in the viewer and set the axis or units if needed.
- Press Convert, orbit the result, then download.
Questions
Is this OBJ to STL converter really free?
Yes, completely. Every tool and every format is free, and there's no paid version, account, watermark or daily limit.
Do my files get uploaded?
No. Your browser does the work on your own device, so your files stay with you. Closing the tab clears them from memory.
Can I convert several files at once?
Drop what you need into the tool on this page, and it lists exactly what it will do first.
Does it work on a phone?
Yes, in a current mobile browser. Large files are limited by how much memory your device can spare.
What should I know about OBJ to STL?
STL stores only the surface, so materials, textures and animation are left out. You can set the up axis and units before exporting, which matters for slicers.
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Ready to convert your OBJ?
- Completely free
- Nothing uploaded
- No account
- No watermark