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PRT STEP
File conversion

Convert PRT to STEP

Verified by Adam B.· reviewed by FE Editorial ·updated Aug 3, 2026
QUICK ANSWER
Is it possible to convert PRT to STEP?
Yes - PRT converts to STEP.

In Creo, use File > Save As > Save a Copy and select STEP as the type. Without Creo, open the .prt in the free CAD Assistant by Open Cascade or in Autodesk Fusion 360 and export to STEP from there. The resulting STEP file opens in SolidWorks, FreeCAD, Onshape, and most other CAD tools.

6 programs
Also to STEP: MODEL · X_B · X_T

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert PRT to STEP?

A Creo .prt is a proprietary binary format readable only by Creo and tools with licensed translators. .step (ISO 10303) is the neutral exchange standard for solid B-rep geometry across mechanical CAD, transferring exact surfaces and solids without loss of dimensional accuracy. Converting to STEP is the standard route for sharing Creo parts with suppliers, manufacturers, or colleagues who use a different CAD system.

How to convert PRT to STEP

PTC Creo Parametric APP

Open the .prt in Creo, go to File > Save As > Save a Copy, select STEP (*.stp or *.step) from the Type dropdown, choose AP214 as the protocol, and click OK.

CAD Assistant FREE

Open the .prt in CAD Assistant (opencascade.com), verify the geometry, then go to File > Export and select STEP as the output format.

Autodesk Fusion 360 FREE

Import the .prt in Fusion 360 via File > Open, then go to File > Export and select STEP (.stp) as the format.

Programs that convert PRT

SolidWorks
CrossManager
3ds Max (3D Studio Max)
Solid Edge
TransMagic
EnSuite

About these formats

.PRT PTC Creo / Pro-ENGINEER Part File

A PRT file is a single 3D part created by PTC Creo Parametric (formerly Pro/ENGINEER). To open it without buying Creo, use the free PTC Creo View or eDrawings viewer. To move the part to…

Open .PRT details →
.STEP STEP - Standard for the Exchange of Product Data (ISO 10303)

A STEP file is a 3D CAD model stored in the ISO 10303 neutral format so engineers can share geometry between different CAD programs. To view one for free, use FreeCAD, CAD Assistant, or…

Open .STEP details →

Quality & what to watch

  • The parametric feature history - sketches, extrudes, fillets, and dimensions - does not transfer to STEP; the output carries the resulting solid geometry only.
  • Creo saves numbered revisions (e.g. bracket.prt.3); open the highest-numbered file before converting to ensure you export the latest version.
  • AP214 is the recommended STEP protocol for most cases as it carries color and layer data; AP203 has broader support with older CAD systems.

Frequently asked questions

Will I lose the feature history when exporting to STEP?
Yes - STEP carries only the resulting solid geometry; the Creo feature tree, sketches, and constraints are not included.
Which STEP protocol should I choose?
AP214 is the safer default and carries color and layer data; use AP203 only if the receiving tool specifically requires it.
Can I convert without a Creo license?
Yes - CAD Assistant (free, cross-platform) and Autodesk Fusion 360 (free personal-use tier) both read Creo .prt files and export STEP.
Why does Creo append a number to the filename?
Creo saves numbered revisions of each part; the file with the highest trailing number is the latest version.