SolidWorks to STEP.
Nothing leaves your computer.
Drop a .SLDPRT part or an assembly folder, get a STEP file back. No SolidWorks, no account, no upload.
Proof: the page may not contact anything but this site (your browser enforces it: view source, line 8), it works offline, no analytics, no cookies.
Drop .SLDPRT or .SLDASM files here
For an assembly, drop the whole folder so every part is found.
Options
Installing the converter in this tab…
Output
Starting…0 s
Small parts take a second; big assemblies a minute or more. This tab stays usable.
Opens in FreeCAD, Fusion, Onshape… Reload the page to clear everything from memory.
Saved you a SolidWorks seat? Buy the author a coffee →
Technical report
Preview
Drag to orbit · scroll to zoom · right-drag to pan
Exact geometry
Rebuilt from the Parasolid data in the file; fillets approximated to ~0.01 mm.
Assemblies too
Placements and names kept; opens as an assembly tree in any CAD tool.
Open source, free
AGPL-3.0, Open CASCADE + sldprt2xt. Also a command-line tool for batches.