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PRT OBJ
File conversion

Convert PRT to OBJ

Verified by Adam B.· reviewed by FE Editorial ·updated Aug 16, 2026
QUICK ANSWER
Is it possible to convert PRT to OBJ?
Yes - PRT converts to OBJ.

Open the .prt in PolyTrans, 3ds Max, TransMagic, or the free CAD Assistant and export as .obj. B-rep solid geometry is converted to a triangle mesh approximation; parametric history and exact curves are not preserved.

5 programs
Also to OBJ: USD · LWO · LIB

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert PRT to OBJ?

Creo .prt files store exact solid geometry (B-rep) in a proprietary format. .obj is a plain-text mesh format used by renderers, game engines, and visualization tools. Engineers convert PRT to OBJ when a downstream pipeline needs a polygon mesh rather than a CAD solid, while choosing .step for CAD-to-CAD exchange that must preserve exact geometry.

How to convert PRT to OBJ

PolyTrans|CAD+DCC APP

Import the .prt file directly and export to .obj. PolyTrans supports native Creo geometry and lets you control tessellation quality before export.

3ds Max (3D Studio Max) APP

Open or import the .prt via a CAD import plugin, then use File > Export to save as .obj. Tessellation settings control polygon density.

TransMagic APP

Open the .prt in TransMagic and use its Export function to save as .obj. TransMagic reads native Creo files without requiring a Creo license.

CAD Assistant FREE

Drag the .prt onto CAD Assistant (Open Cascade, free) and use File > Export > OBJ. Adjust tessellation quality in the export dialog before saving.

Programs that convert PRT

PolyTrans|CAD+DCC
3ds Max (3D Studio Max)
TransMagic
Online CAD converter
Babel3D

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 →
.OBJ Wavefront OBJ (3D geometry)

An OBJ file is a 3D model in the Wavefront OBJ format - a plain-text list of vertices, faces, and surface normals. Open it free with Blender, the Microsoft 3D Viewer on Windows, or…

Open .OBJ details →

Quality & what to watch

  • B-rep geometry is lost: OBJ is a polygon mesh approximation, not an exact solid. Parametric history, sketches, dimensions, and feature data cannot be recovered from the output.
  • Tessellation quality controls polygon count. A coarse setting produces blocky curves; fine tessellation gives smoother results but a larger file. Adjust this in the export dialog.
  • Creo saves part revisions as part.prt.1, part.prt.2 etc. The highest-numbered file is the latest version - open that one.

Frequently asked questions

Can I convert PRT to OBJ for free?
Yes. CAD Assistant from Open Cascade is free and handles native Creo .prt files on Windows, macOS, and Linux.
Will the OBJ file keep exact surface curvature?
No. OBJ stores flat triangles; smooth curves are approximated by tessellation. For exact geometry exchange, use STEP instead.
Why is my converted OBJ blocky?
Tessellation quality was set too low during export. Re-export with a higher or finer tessellation setting in your CAD tool.
Do I need a Creo license to convert the file?
No. Tools like CAD Assistant and TransMagic read native Creo files without requiring a PTC license.