CAD & 3D
OBJ to STL Converter
Convert OBJ models to STL online. Create binary or ASCII STL files for 3D printing directly in your browser without uploading data.
Tool
Convert OBJ models to STL online. Create binary or ASCII STL files for 3D printing directly in your browser without uploading data.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free online OBJ to STL Converter to transform Wavefront OBJ geometry into STL files for 3D printing, slicing, manufacturing, and mesh-based CAD workflows. Load the OBJ file, inspect the geometry, verify the dimensions, choose binary or ASCII STL, and download the converted model. Materials, textures, colors, groups, and other OBJ-specific information cannot be preserved in standard STL. Processing runs locally in your browser.
Examples
- multi-group.obj
Frequently Asked Questions
What information is lost when converting OBJ to STL?
STL stores only triangular surface geometry and optional face normals. OBJ materials, textures, UV coordinates, object names, groups, colors, and smoothing definitions are not preserved.
Can OBJ polygons with more than three vertices be converted?
Yes. Quads and other polygonal faces are triangulated during conversion because STL supports triangles only.
Do I need the MTL and texture files?
No. They are not required for geometry conversion because STL cannot preserve materials or textures. The OBJ file itself must contain valid vertex and face data.
Should I export binary or ASCII STL?
Binary STL is recommended for most uses because it is smaller and faster to process. ASCII STL is readable as text but can be substantially larger.
Will the converted STL automatically be printable?
Not necessarily. The geometry may still contain holes, disconnected shells, self-intersections, non-manifold edges, incorrect scale, or walls that are too thin for printing.
How are multiple OBJ objects handled?
Separate OBJ objects and groups can be combined into one STL mesh or exported individually, depending on the converter settings.
Is my OBJ file uploaded?
No. The model is parsed and converted locally in your browser.