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PRT STP
File conversion

Convert PRT to STP

Verified by Adam B.· reviewed by FE Editorial ·updated Jul 30, 2026
QUICK ANSWER
Is it possible to convert PRT to STP?
Yes - PRT converts to STP.

In Creo, go to File > Save As > Save a Copy and select STEP (*.stp) from the Type dropdown. Without Creo, use the free CAD Assistant - open the .prt, go to File > Export, and save as STEP. STP and STEP are identical; renaming one extension to the other changes nothing in the file.

6 programs
Also to STP: JT · 3DM · X_T

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert PRT to STP?

A Creo .prt is a proprietary binary format readable only by Creo and tools with licensed translators. .stp/STEP (ISO 10303) is the neutral exchange standard for mechanical CAD, transferring exact B-rep solid geometry to SolidWorks, FreeCAD, Onshape, and virtually any other CAD system. The .stp spelling is the older three-character version of the .step extension, used on systems that limited extensions to three characters.

How to convert PRT to STP

PTC Creo Parametric APP

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

CAD Assistant FREE

Open the .prt in CAD Assistant (opencascade.com), verify the model in the 3D view, then go to File > Export, select STEP, and save with a .stp extension.

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
3ds Max (3D Studio Max)
Solid Edge
TransMagic
CrossManager
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 →
.STP STEP - Standard for the Exchange of Product Data (ISO 10303), .stp spelling

An STP file is a 3D CAD model - a part or assembly - stored in the ISO 10303 STEP format so it can move between different CAD programs. The fastest free options are FreeCAD, CAD Assistant,…

Open .STP details →

Quality & what to watch

  • STP and STEP are identical formats - the .stp extension is the older three-character spelling; rename between them freely without any change to file contents.
  • The parametric feature history - sketches, extrudes, fillets, and dimensions - does not transfer to STP; the output is the resulting solid geometry only.
  • Creo saves numbered revisions (e.g. bracket.prt.3); open the highest-numbered file before converting to get the latest version.

Frequently asked questions

What is the difference between STP and STEP?
There is no difference - .stp is the older three-character spelling of .step; both refer to the same ISO 10303 format and are interchangeable.
Which STEP protocol should I choose in Creo?
AP214 is the recommended default as it 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 import Creo .prt files and export STP.
Will I lose the feature history?
Yes - STP carries only the resulting solid geometry; the Creo feature tree, sketch constraints, and dimensions are not included.