Convert STP to IPT

A supplier may deliver a part as .stp or .step when an Inventor project requires an editable .ipt component. Converting it places the geometry in Inventor, but usually does not restore the source model's feature history.

What the STP format is

STP, also written as .step, is the usual extension for STEP, the ISO 10303 neutral CAD exchange format. STEP primarily stores precise boundary-representation geometry and can also carry assembly structure, colors, layers, units, and other product data depending on the application protocol used.

Autodesk Inventor, SolidWorks, CATIA, Siemens NX, PTC Creo, FreeCAD, and Onshape can import or export STEP. Suppliers, customers, engineering contractors, legacy CAD systems, and component libraries commonly use it to exchange models between different CAD applications.

What the IPT format is

.ipt is Autodesk Inventor's native part format. It can contain solid or surface bodies, sketches, constraints, parameters, construction geometry, iFeatures, and the Inventor feature browser.

IPT is the suitable target when the component must be edited in Inventor, placed in an Inventor assembly, or stored with Inventor project files. It is not a neutral interchange format; other CAD systems may not read it without a compatible Inventor translator.

How to convert STP to IPT

Using Autodesk Inventor

1. Open Inventor and choose File → Open → Open.
2. Set the file type to STEP Files (*.stp; *.step), select the source file, and open it.
3. In the import dialog, verify the units and select the required options for geometry healing, validation, and assembly structure. Available options vary by Inventor version and STEP content.
4. After translation, inspect the model browser and graphics window. Check body count, assembly components, missing faces, gaps, small features, and several known dimensions.
5. For a single-part result, choose File → Save As → Save Copy As, select Autodesk Inventor Part (*.ipt), and save the file.

If the STEP file contains an assembly, Inventor may produce an assembly document and separate component parts rather than one IPT. Save component parts as .ipt and the assembly as .iam; combining an assembly into one part can discard component relationships and assembly structure.

Other conversion options

Autodesk Inventor is the most dependable desktop option because it directly translates STEP and saves the result in Inventor's native format. CAD Exchanger, SolidWorks, Siemens NX, CATIA, and PTC Creo are useful for inspecting or repairing STEP geometry, but their ability to export a valid native .ipt depends on the product, license, and version. Confirm IPT export in the vendor's current format list before purchasing or relying on one.

CAD Exchanger's desktop or cloud converter can be considered when its current format matrix explicitly lists Autodesk Inventor .ipt as an output. Cloud conversion is unsuitable for confidential designs unless the provider's retention, deletion, and access policies meet the project's requirements. Many online services accept STEP but output only formats such as STEP, IGES, STL, OBJ, or Parasolid, so an apparent CAD conversion service may not create a native IPT file. Do not upload a file until both the IPT output and data-handling terms are confirmed.

Quality and compatibility limits

STEP normally transfers geometry, not the originating application's editable feature tree. The IPT will commonly contain an imported or base feature, so original sketches, constraints, fillets, holes, parameters, and design history will not be available for direct editing. Recreate critical design features in Inventor when parametric control is required.

Verify units after import. A millimetre-to-inch interpretation changes dimensions by a factor of 25.4. Measure known dimensions and inspect threaded regions, thin walls, tangent faces, small fillets, and openings before using the part for manufacturing.

Single-body STEP files generally produce the simplest IPT results. Multi-body models, assemblies, flexible components, and unsupported STEP entities may require separate component imports or repair with Inventor's geometry diagnostics. Retain the original .stp file with the converted .ipt as the neutral reference for verification and future translation.