CAD & 3D
STL to OBJ Converter
Convert STL files to OBJ online. Transform binary or ASCII STL meshes locally in your browser without uploading your model.
Tool
Convert STL files to OBJ online. Transform binary or ASCII STL meshes locally in your browser without uploading your model.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free online STL to OBJ Converter to transform binary or ASCII STL files into the widely supported Wavefront OBJ format. Load the STL model, inspect its geometry and dimensions, recalculate smooth or flat normals where needed, and download the converted OBJ file for editing, rendering, visualization, or use in other 3D applications. The original triangle geometry is processed locally in your browser.
Examples
- cube-ascii.stl
- cube-binary.stl
Frequently Asked Questions
Why convert STL to OBJ?
OBJ is supported by many 3D modeling, rendering, animation, and visualization applications. It can also store object groups, texture coordinates, normals, and material references that STL does not normally support.
Will the OBJ file have textures or colors?
Standard STL files do not contain textures or reliable material information. The converted OBJ therefore normally contains geometry and normals only unless materials are assigned separately.
Does conversion change the triangle count?
Normally, the source triangles are preserved. The converter may merge duplicate vertices or recalculate normals, but it does not simplify or increase mesh detail unless an additional optimization option is selected.
Can the converter generate smooth shading?
Yes. Vertex normals can be generated to produce smoother visual shading. This changes how the surface is rendered but does not change the actual geometry.
Does STL contain a model unit?
No. STL files do not define a unit. The OBJ coordinates use the same numerical scale unless you explicitly apply a unit conversion.
Can an ASCII STL and a binary STL both be converted?
Yes. The converter supports both common STL encodings and writes their geometry to OBJ.
Is my model uploaded?
No. The STL file is converted locally in your browser.