What this tool does
Use this STEP to STL converter to tessellate CAD geometry into an STL mesh locally in your browser.
When this tool fits
Best when a CAD model needs slicer mesh export
STEP and STP solids are tessellated into STL triangles for printing workflows.
Best for simple parts and solids
browser-side CAD tessellation works best when the file contains exportable solid geometry.
Best when CAD history is not needed
STL is mesh-only and does not preserve sketches, constraints, or parametric features.
How to use it
- 1
Upload a STEP or STP file
Choose a CAD file that contains exportable solid geometry.
- 2
Wait for browser tessellation
The page loads the CAD data through WebAssembly and builds a triangle mesh.
- 3
Check preview and dimensions
Confirm mesh count, triangle count, and size before exporting.
- 4
Download STL
Export the tessellated CAD geometry as a binary STL file.
Specs and limits
- Input
- STEP and STP
- Output
- Binary STL
- Engine
- Browser-side OCCT WebAssembly
- Preserves
- Approximated shape and model scale
- Does not preserve
- CAD history, features, sketches, or constraints
- STL is a tessellated mesh and does not preserve CAD history.
- Exact curves are approximated by triangles.
- Large CAD files can be slower in the browser.
FAQ
Does STEP to STL run locally?
Yes. STEP files are processed in the browser through WebAssembly and are not uploaded.
Why can a STEP file convert with no mesh?
Some assembly files contain references or structure without exportable solid geometry. The tool reports this state directly.
Why does STEP conversion take longer than GLB conversion?
STEP files describe CAD surfaces that must be tessellated into triangles before STL export, while GLB already stores mesh geometry.