STP to STL conversion is useful when a CAD part with the .stp extension needs to become a printable mesh. This tool reads the STP file locally in your browser, tessellates CAD surfaces into triangles, and writes a binary STL you can preview before downloading. Your files never touch our servers.
How to convert STP to STL online
- Upload a .stp or .step CAD file from your computer.
- Click Convert to read the CAD model in your browser.
- Let the tool tessellate solids and surfaces into STL triangles.
- Preview the STL mesh and check the part dimensions.
- Download the .stl file and inspect it in your slicer.
STP and STEP are the same format with different file extensions. This page targets the shorter STP keyword, but the converter accepts both.
What changes when STP becomes STL
STP files can store precise CAD surfaces, assemblies, names, and metadata. STL stores triangle geometry only. The conversion approximates curved and exact CAD faces as a mesh for slicing.
The STL output does not include feature history, editable sketches, exact CAD curves, assembly constraints, colors, or material names. If you need the STEP spelling for the same workflow, use STEP to STL. For mesh editing, try STP to OBJ.