IGES file: How to open? The best software for opening iges files

IGES

IGES 3D exchange format

File type: 3d graphics, CAD-CAM-CAE file

Files with igs extension can be typically found as 3D graphics data saved in International Graphics Exchange Standard (IGES) format used for data exchange.

What is iges file?

File type category:
3d graphics, CAD-CAM-CAE file

Date updated: June 21, 2025

The iges file extension is commonly used for files in International Graphics Exchange Standard (IGES), an ANSI-approved standard format used with 3D wire frame models originally created in 1979.

One must be very careful when sourcing CAD files from all of today's modern CAD packages, as most/many of them export the long-obsolete "Surfaces NURBS" variation (few people know these differences). There are 3 primary versions of IGES: the 1980's "Bounded Surfaces", the 1990s "Surfaced NURBS" and the 2000's modern "BREP Manifold Solids". One should only export an IGES file in the latter "BREP Manifold Solids" version of IGES. If you try to convert via "Surfaced NURBS" (which has no BREP topology) then the model will be exploded into thounsads of individual NURBS patches, leading to patch cracking, flipped or randomly oriented surfaces, inverted vertex normals (for smoothing) and black banding effects. People on forums often complain that IGES is not a good CAD conversion file format but that is only because they are using the wrong version and/or poor 3D IGES importers. Note: IGES files are limited to a file size of 2GB due to their limited internal numeric range.

The igs file contains IGES 2S or 3D CAD model.

MIME types:
application/iges
model/iges

How to open iges file?

Usually *.igs files can be imported to several CAD programs such as CATIA or Autodesk AutoCAD (might require plugin).

How to convert iges file?

Most of the modern CAD/3D modeling programs support IGS/IGES format.

Suggested software to open iges file:

Associated software actions with the iges file

Open

Software applications that can open iges files:

AutoCAD (Microsoft Windows)

ZEMAX (Microsoft Windows)

Creo Parametric (Microsoft Windows)

TopSolid (Microsoft Windows)

Autodesk Inventor (Microsoft Windows)

Afanche 3D Viewer for Mac (Apple macOS / Mac OS X)

AutoCAD for Mac (Apple macOS / Mac OS X)

Edit

Software applications that can edit iges files:

AutoCAD (Microsoft Windows)

ZEMAX (Microsoft Windows)

Creo Parametric (Microsoft Windows)

TopSolid (Microsoft Windows)

Autodesk Inventor (Microsoft Windows)

AutoCAD for Mac (Apple macOS / Mac OS X)

Save

Software capable of saving iges files:

AutoCAD (Microsoft Windows)

ZEMAX (Microsoft Windows)

Creo Parametric (Microsoft Windows)

TopSolid (Microsoft Windows)

Autodesk Inventor (Microsoft Windows)

AutoCAD for Mac (Apple macOS / Mac OS X)

View

Programs for viewing iges files:

AutoCAD (Microsoft Windows)

ZEMAX (Microsoft Windows)

VariCAD Viewer (Microsoft Windows)

3D-Tool (Microsoft Windows)

Afanche 3D Viewer for Mac (Apple macOS / Mac OS X)

AutoCAD for Mac (Apple macOS / Mac OS X)

VariCAD Viewer for Linux (Linux/Unix)

LX-Viewer (Linux/Unix)

Convert

Software apps that convert iges files:

AnyCAD Exchange3D (Microsoft Windows)

Autoconverter (Microsoft Windows)

Import

Software apps that import iges files:

SolidWorks (Microsoft Windows)

INOVATE (Microsoft Windows)

ACE 3000 (Microsoft Windows)

CrossManager (Microsoft Windows)

MEDUSA4 (Microsoft Windows)

T-FLEX CAD (Microsoft Windows)

Creo Parametric (Microsoft Windows)

SolidWorks Visualize (Microsoft Windows)

3ds Max (3D Studio Max) (Microsoft Windows)

Cimatron (Microsoft Windows)

Keyshot (Microsoft Windows)

PolyTrans|CAD+DCC (Microsoft Windows)

Alibre Design Professional (Microsoft Windows)

NX (Microsoft Windows)

ViaCAD 2D/3D (Microsoft Windows)

Solid Edge (Microsoft Windows)

KeyCreator (Microsoft Windows)

Open CASCADE Technology (Microsoft Windows)

MicroStation (Microsoft Windows)

Surfcam (Microsoft Windows)

Cadwork 3D (Microsoft Windows)

ViaCAD Pro (Microsoft Windows)

EnSuite (Microsoft Windows)

Anark Core (Microsoft Windows)

CAD Exchanger (Microsoft Windows)

BobCAD-CAM Mill (Microsoft Windows)

3D-Tool (Microsoft Windows)

Shapr3D (Multiplatform)

Online CAD Viewer (Multiplatform)

IGES to SVG converter (On-line services)

3D Transform (On-line services)

Online CAD converter (On-line services)

Export

Software apps that export iges files:

ACE 3000 (Microsoft Windows)

CrossManager (Microsoft Windows)

3D Object Converter (Microsoft Windows)

SolidWorks (Microsoft Windows)

IronCAD (Microsoft Windows)

MEDUSA4 (Microsoft Windows)

Alibre Design Professional (Microsoft Windows)

TransMagic (Microsoft Windows)

PolyTrans|CAD+DCC (Microsoft Windows)

DipTrace (Microsoft Windows)

VariCAD (Microsoft Windows)

3ds Max (3D Studio Max) (Microsoft Windows)

MicroStation (Microsoft Windows)

Parasolid (Microsoft Windows)

Solid Edge (Microsoft Windows)

ArtiosCAD (Microsoft Windows)

Autodesk Inventor (Microsoft Windows)

ViaCAD Pro (Microsoft Windows)

EnSuite (Microsoft Windows)

3D-Tool (Microsoft Windows)

CAD Exchanger (Microsoft Windows)

Xenon (Multiplatform)

Autodesk Fusion 360 (Multiplatform)

Software apps that print iges files:

AutoCAD (Microsoft Windows)

ZEMAX (Microsoft Windows)

VariCAD Viewer (Microsoft Windows)

Creo Parametric (Microsoft Windows)

Afanche 3D Viewer for Mac (Apple macOS / Mac OS X)

AutoCAD for Mac (Apple macOS / Mac OS X)

VariCAD Viewer for Linux (Linux/Unix)

Other actions

Software applications that handle other tasks involving iges files:

Creo Parametric (Microsoft Windows)