Free online STEP to IGS converter

How to convert step to igs. Possible step to igs converters.

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.step .igs

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How to convert step to igs file

June 7, 2026
CAD formats
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Many CAD programs should be able to convert STEP product data CAD files to their IGES ASCII counterparts. Such step to igs conversion is usually done with dedicated export function, or by simple re-saving the data using any program that supports both formats.

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Understanding STEP and IGS file formats

STEP and IGS are both file formats used in the field of computer-aided design (CAD). STEP (Standard for the Exchange of Product model data) files, with the extension .step or .stp, are used to represent 3D objects in a standardized way, allowing for easy sharing and collaboration across different CAD software. IGS (Initial Graphics Exchange Specification) files, with the extension .igs or .iges, are also used for representing 3D models but are based on an older standard. IGS files are widely used for exchanging information between different CAD systems.

Why convert STEP to IGS?

Converting STEP files to IGS can be necessary when working with older CAD systems that do not support the STEP format. By converting to IGS, you ensure compatibility and maintain the ability to share and edit 3D models across various platforms.

Best software for STEP to IGS conversion

Several software options are available for converting STEP files to IGS. One of the most reliable and widely used is Autodesk Fusion 360. This software provides a comprehensive suite of tools for CAD design and supports a wide range of file formats.

How to convert STEP to IGS using Autodesk Fusion 360

Open Autodesk Fusion 360 and import your STEP file by clicking File → Open and selecting the STEP file you wish to convert.
Once the file is open, navigate to File → Export.
In the export dialog, choose IGES as the file format.
Click Export to save the file in the IGS format.

Alternative software options

Other software that can perform STEP to IGS conversion includes SolidWorks and FreeCAD. Both offer similar functionality and can be used if you do not have access to Autodesk Fusion 360.

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STEP vs IGS: format comparison

How the STEP and IGS formats compare on the properties that matter most for this conversion.

Comparison of the STEP and IGS file formats
Property	.STEP Standard for the Exchange of Product model data	.IGS Initial Graphics Exchange Specification
Dimensions	3D	3D
Geometry	Both	Both
Layers	—	No
Materials	Yes	Limited
Plain-text readable	Yes	No
Operating system support	Wide	Wide
Typical file size	Medium	Medium
Open standard	Yes	Partly open
Introduced	1994	—
Developer	ISO	IGES/PDES organization (later managed by various standards bodies, including ANSI/ASME)
MIME type	application/step	—

Open STEP file Open IGS file

Suggested software and links: step to igs converters

3D-Tool

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AutoCAD

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CAD Exchanger

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CATIA

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EnSuite

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FreeCAD

An open source multiplatform 3D CAD/MCAD/CAx/CAE/PLM modeler

PolyTrans|CAD+DCC

A 3D and CAD file formats conversion software

Solid Edge

A feature rich 3D CAD software by Siemens

SolidWorks

A 2D and 3D CAD construction software

TopSolid

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TurboCAD

A family of 2D/3D CAD software products for Windows

TurboCAD for Mac

A 2D/3D CAD software for OS X

ViaCAD Pro

A 2D, 3D modeling tool

Frequently asked questions

Is the STEP to IGS converter free?

Yes, converting STEP to IGS on 101convert.com is completely free. No registration, email address or installation is required.

How large can my STEP file be?

You can upload STEP files up to 500 MB and convert up to 5 files at once in a single batch.

What happens to my uploaded files?

Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.

Do I need to install any software to convert STEP to IGS?

No. The STEP to IGS conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.

Did the conversion fail?

In most cases, the cause is an incorrect file format. Please upload a valid STEP file for this STEP to IGS conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.

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Additional formats for
step file conversion

Reverse conversion

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