3D / CAD to STL
Convert static meshes and FBX/DAE scenes; tessellate STEP, IGES or BREP solids locally.
Drop your files here
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Multiple files welcome · processed one at a time
Select a tool to see its supported formats and conversion limits. Large files may exceed your browser’s memory.
Before processing large files
On phones and tablets, start with files under 20 MiB and keep this tab in the foreground. Video, OCR and 3D operations can use several times the input size in memory. Desktop browsers generally have more room, but the 128 MiB job limit is not a guarantee that every file will fit. Smaller batches reduce memory pressure.
Supported input formats
- Wavefront OBJ model (.obj)
- Polygon File Format model (.ply)
- GL Transmission Format model (.gltf)
- Binary glTF model (.glb)
- Filmbox model (.fbx)
- COLLADA model (.dae)
- STEP CAD model (.step)
- STEP CAD model (.stp)
- Initial Graphics Exchange Specification (.iges)
- Initial Graphics Exchange Specification (.igs)
- Boundary representation model (.brep)
Output format
STL triangle mesh (.stl)
Support applies to this conversion direction. Check the limits below for features that may change or be discarded.
Compare all supported formats and conversion limits →How to use 3D / CAD to STL
- Add your supported file using the chooser or drop zone.
- Review the settings and conversion limits before processing.
- Select Convert files, then download the result.
What to expect
- Maximum input 80 MB. STEP / IGES tessellation uses millimeters. STL / OBJ / PLY use source units.
- Self-contained uncompressed glTF/GLB only; external buffers/images, skins and morph targets are rejected. Animation is discarded.
- FBX/DAE base geometry must be contained in one file. FBX blend shapes and animation are discarded; skins, COLLADA controllers, points and lines are rejected. Assimp applies scene transforms and importer unit/axis conventions; check dimensions before manufacturing. Maximum 2 million expanded vertices. External textures are ignored and never fetched.
- Triangle geometry export only. CAD solids become triangles; hierarchy, materials, textures, normals, UVs, vertex/face colors, animation and rigging are discarded. CAD export is unavailable.
Engine: Three.js + Assimp + Open CASCADE. The engine may need a first-use download. Your file stays in this browser session.Check conversion engines and offline requirements.
About this conversion
Is 3d / cad to stl free?
Yes. This tool runs on your device without an account or a conversion fee.
Are files uploaded during conversion?
File processing happens locally in your browser. Engines may download their code on first use; your input files are not sent to a conversion server. Read how file privacy works.
What if conversion fails?
Check that the file matches a supported input, review the engine’s limitations and try a smaller representative file. If the engine cannot load, check its engine assets and browser requirements. The app reports failures without switching to a remote converter.
Continue with your output
These tools accept this tool’s output format. Each step has its own settings and fidelity limits.
- 3D / CAD to OBJ
Convert static meshes and FBX/DAE scenes; tessellate STEP, IGES or BREP solids locally.
- 3D / CAD to PLY
Convert static meshes and FBX/DAE scenes; tessellate STEP, IGES or BREP solids locally.
- 3D / CAD to GLB
Convert static meshes and FBX/DAE scenes; tessellate STEP, IGES or BREP solids locally.
- 3D / CAD to GLTF
Convert static meshes and FBX/DAE scenes; tessellate STEP, IGES or BREP solids locally.
- Create TAR.GZ
Bundle selected files into a gzip-compressed USTAR archive.
- Create ZIP
Bundle the selected files into one compressed ZIP archive.