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IGES 3D exchange format
File type: 3d graphics, CAD-CAM-CAE file
Files with igs extension can be found as 3D graphics models saved in International Graphics Exchange Standard (IGES) format used for data exchange.
Found 2 different file type records with the same igs filename suffix.
File type category:
3d graphics, CAD-CAM-CAE file
Date updated: June 21, 2025
File extension igs is commonly referring to 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.
MIME types:
application/iges
model/iges
Usually *.igs files can be imported to several CAD programs such as CATIA or Autodesk AutoCAD (might require plugin).
Most of the modern CAD/3D modelling programs support IGS/IGES format.
Software applications that can open igs files:
Microsoft Windows
Apple macOS / Mac OS X
Software applications that can edit igs files:
Microsoft Windows
Apple macOS / Mac OS X
Software capable of saving igs files:
Microsoft Windows
Programs for viewing igs files:
Software apps that convert igs files:
Microsoft Windows
AnyCAD Exchange3D
Software apps that import igs files:
Microsoft Windows
Apple macOS / Mac OS X
Multiplatform
On-line services
Software apps that export igs files:
Microsoft Windows
Apple macOS / Mac OS X
Multiplatform
On-line services
Software apps that print igs files:
Apple macOS / Mac OS X
File type category:
3d graphics, CAD-CAM-CAE file
Date updated: February 3, 2017
The igs file extension is associated with the Indigo Renderer, a physicall based and photorealistic rendering software for Microsoft Windows operating system.
The igs file stores scene from Indigo Renderer.
Use Indigo Renderer to work with *.igs files.
Indigo Renderer may be able to export *.igs files to other formats.
Software applications that can open igs files:
Microsoft Windows
Software applications that can edit igs files:
Microsoft Windows
Software capable of saving igs files:
Microsoft Windows
Software apps that create igs files:
Microsoft Windows
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