Convert OBJ to STL
Convert OBJ to STL free in your browser. No upload, no signup, no watermark. Files stay on your device.
drop a .obj file
or click to browse
related
more obj & stl
see all 3D model converters →guide
how to convert obj to stl
Add your OBJ file
Drag and drop your OBJ file into the drop zone above, or click the box to browse for a file.
Click Convert
The conversion happens locally in your browser. No upload, no server, no waiting in queue.
Download the STL file
When the conversion finishes, the STL file is ready to download. Save it anywhere on your device.
FAQ
common questions
Is the OBJ to STL converter free?
Yes. Every conversion on this site is free, with no signup, watermark or file count limit.
Are my files uploaded to a server?
No. Conversion runs entirely in your browser using three.js. Your files never leave your device, so we cannot see them even if we wanted to.
Is there a file size limit for OBJ to STL?
There's no hard limit. In practice, file size is bounded by your device's available memory — typically several hundred megabytes work fine on a modern computer.
Does it work offline?
Once this page has loaded, yes. You can disconnect from the internet and the converter will still work. Reloading the page does require connectivity.
Will my OBJ file lose quality when converted to STL?
It depends on the formats involved. Converting between lossy formats (JPG, MP3) re-encodes data and slightly reduces quality. Lossless formats (PNG, WAV, FLAC) preserve everything. Pixel dimensions and color depth are preserved for image conversions.