Free 3D converter / OBJ to STL
Convert OBJ to STL, free and online
Turn a .obj file into a .stl file. It runs in your browser: no sign-up and nothing to install, and most files never leave your computer.
Drop your OBJ file here
or choose a file
Free · No sign-up · Converted in your browser · Files up to 1 GB
What you get: STL keeps geometry only: colours, materials and textures are dropped, and every part goes into one STL.
How to convert OBJ to STL
- 1Drop your .obj file
On the converter above, or click to choose it. - 2Click Convert to STL
The .stl file downloads straight away.
OBJ vs STL
OBJ: OBJ is a simple, widely read mesh format: triangles or polygons, with materials in a separate .mtl file.
STL: STL describes a shape as triangles only: no units, no colours, no curves. It's what 3D printers, slicers and scanners use.
Other conversions
All conversions →Is the OBJ to STL converter free?
Yes, with no sign-up and no limit on the number of files. A free account is only needed if you want to send the model to someone for feedback.
Is my file uploaded?
Most files are read and converted right in your browser and never leave your computer. Very large CAD and mesh files are converted on our server instead, then deleted straight after the converted model is sent back to your browser.
What's the biggest OBJ I can convert?
Up to 1 GB. Big files take longer, and very large CAD files go through our server, as above.
Does it keep colours?
No. STL has no colours or materials, only the shape. Convert to GLB to keep them.
Converting it to send to a client or supplier?
Send them a link instead. They open the model in any browser, with no account and no CAD program, and click the spot they want changed.