.IGS File Extension

.IGS File Extension

2 file types use the .igs file extension.
File Type 1

IGES Drawing

Developer N/A
3.7  |  51 Votes
Category CAD Files
Format Text

What is an IGS file?

An IGS file is a graphics file saved in a 2D/3D vector format based on the Initial Graphics Exchange Specification (IGES). It can store wireframe models, surface or solid object representations, circuit diagrams, and other objects. IGS files are used by many CAD programs as a standard ASCII text-based format for saving and exporting vector data.

More Information
Screenshot of a .igs file in CADEX CAD Exchanger 3.7
IGS file open in CADEX CAD Exchanger 3.7

IGES is a standard for transferring three-dimensional models between CAD programs. You will most likely encounter an IGS file only if you work with CAD software in a field that involves manufacturing, such as the automotive or aerospace industries.

The IGES format was officially introduced in 1980 and was subsequently adopted by many CAD programs. In recent years, however, it has been replaced by the newer STEP (.STP) format.

NOTE: IGS files may also be saved as .IGES files.

How do I open an IGS file?

You can open IGS files with various desktop CAD programs, such as Autodesk Fusion 360 (Windows), Dassault Systemes CATIA (multiplatform), Nemetschek VectorWorks (multiplatform), and CADEX CAD Exchanger (macOS). You can also open and view IGS files with online viewers by uploading them to CADEX CAD Exchanger Cloud or ShareCAD.org.

Since IGS files store plain text information they can be opened with a text editor. However, when viewing the files with a text editor, the contents will appear as text instead of a visual representation of a model, like when viewed with CAD software. You can use Microsoft Wordpad, which is bundled with Windows, or Apple TextEdit, which is bundled with macOS, to view the plain text in IGS files.

How do I convert an IGS file?

Most CAD applications that can open IGS files can also convert them to other formats. For example, CAD Exchanger can open IGS files and convert them to another format, such as .STP, .STEP, .SAT., .STL, .BREP, or .JT.

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Programs that open IGS files

Updated May 3, 2021
File Type 2

Indigo Renderer Scene File

Developer Glare Technologies
3.3  |  18 Votes
Category 3D Image Files
Format N/A

What is an IGS file?

3D scene used by Indigo Renderer, an application used for generating photorealistic images; often saved as an export from another 3D modeling package that has the Indigo Renderer plug-in, including Blender, 3ds Max, Cinema 4D, Maya, SketchUp, or Revit.

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Once a 3D scene has been imported into Indigo Renderer, it can be rendered into a final image. The software supports GPU acceleration so that images can be generated more quickly.

Programs that open IGS files

Updated July 19, 2012

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