How to convert CATPART to STP
- Add your .CATPART file - drop it in the box above or click to browse.
- Convert it to .STP in a few seconds.
- Download your new .STP file.
What to expect
.stpand.stepare identical - both name the same ISO 10303 format; renaming the extension is all it takes to switch between them.- Feature history does not transfer: the CATIA parametric tree (sketches, pads, pockets) is lost, leaving only the final solid geometry.
- STEP preserves exact B-rep surfaces so dimensions stay accurate - unlike
.stl, which approximates curved surfaces as triangles.
Frequently asked questions
Can I just rename a `.step` file to `.stp`?
Yes - both extensions refer to the identical ISO 10303 STEP format and renaming does not alter the file content.
Do I need CATIA to convert a CATPart to STP?
No. The free CAD Assistant by Open Cascade reads native
.catpart files and exports to STEP on Windows, macOS, and Linux.Will the `.stp` file open in SolidWorks, Inventor, or FreeCAD?
Yes - STEP is a universal neutral format; those tools import it directly as a solid body without the original CATIA feature tree.
Can I convert back from STP to CATPart?
CATIA can import a STEP file, but it arrives as a dumb solid - the original parametric feature history cannot be recovered.
Programs that convert CATPART: CATIA · Autodesk Inventor · 3ds Max (3D Studio Max) · TransMagic · CrossManager · Alibre Design Professional · EnSuite · 3D-Tool
