One converter, five 3D formats
Convert OBJ to STL
Open a OBJ model, inspect the parsed geometry and export a STL copy. The page explains format-specific losses before download.
- 20 conversion directions
- STL · GLB · OBJ · FBX · 3MF
- Static geometry preview
OBJ to STL converter
Files up to 200 MiB; scenes are bounded to 100 meshes and 4,200,000 triangles.
STL keeps triangle geometry only; materials, textures, hierarchy, animation and declared units are lost.
Waiting for a file.
All supported conversions
Choose any source and a different target. Every link opens the same converter with that pair selected.
How the 3D converter works
Choose both formats
Set the real source format and the format you need to download.
Open and inspect
The browser parses the model and shows dimensions, mesh count and format-loss warnings.
Download the conversion
Export the visible static geometry and verify scale and materials in the destination application.
What changes from OBJ to STL
A OBJ source can contain triangle geometry, normals, UV coordinates.
STL is a unitless triangle surface format. The download is geometry-only and should be treated as millimeters for printing.
Scale path: OBJ declares no unit, so the source-unit selector defines its millimeter scale. STL output is unitless; its coordinates follow the tool's millimeter assumption.
Guaranteed in this conversion: triangle geometry.
This static conversion does not transfer normals, UV coordinates.
Limits and checks you still need
- The first release exports the visible static mesh; rigs, animation clips, cameras and lights are not guaranteed across formats.
- OBJ is handled as one geometry file, without separate MTL files or external textures.
- Large or unusually complex files can exceed browser memory even below the file-size limit.
Related 3D tools
Frequently asked questions
Can I convert OBJ to STL for free?
Yes. The converter runs without an upload API or account and downloads the result from this tab.
Does the model leave my device?
No model bytes are sent to AIPRINTGEN. Libraries load only when needed, then conversion uses the local File object.
Will textures and animation survive?
Not in every direction. The warning beside the result reflects the selected target; inspect the downloaded file in its destination app.
Why should I check the scale?
STL and OBJ do not declare a universal unit, while GLB, FBX and 3MF have different unit conventions.
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