Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.IGS
File Type
Initial Graphics Exchange Specification
Category
Data
Best first step
Use compatible software
Quick Summary
A practical overview of the .igs file format
The IGES (Initial Graphics Exchange Specification) file format, identified by the .igs extension, is a vendor-neutral file format designed for transferring 2D and 3D geometric data between different CAD (Computer-Aided Design) systems. It was one of the earliest standards developed for this purpose…
File extension
.IGS
File type
Initial Graphics Exchange Specification
Category
Data
Recommended action
Open with a trusted compatible app
How to open a .igs file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .igs.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .igs file?
File extension details and usage information
The IGES (Initial Graphics Exchange Specification) file format, identified by the .igs extension, is a vendor-neutral file format designed for transferring 2D and 3D geometric data between different CAD (Computer-Aided Design) systems. It was one of the earliest standards developed for this purpose, aiming to overcome the interoperability issues that arose from proprietary CAD file formats. IGES files store information about geometric entities such as points, lines, arcs, splines, surfaces, and solids. They can also contain annotation data like dimensions and text. While IGES has been largely superseded by more modern formats like STEP (.stp), it remains in use, particularly for legacy data and in situations where a widely supported, albeit older, standard is preferred. The format is an ASCII-based format, making it relatively easy to inspect and edit manually, although this also contributes to larger file sizes compared to binary formats. IGES files are often used in industries such as automotive, aerospace, and manufacturing for exchanging design data between different departments or companies using different CAD software packages. The standard is defined by ANSI standard ANSI Y14.26M.
Software Compatibility
Programs that may open or work with .igs files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .igs files be converted?
Options for saving or exporting this file to another format
In many cases, a .igs file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .igs file.
Why can't I open a .igs file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .igs format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .igs files
To open a .igs file, use software that supports this file format.
- AutoCAD
- SolidWorks
- CATIA
- NX (Unigraphics)
- Creo Parametric (Pro/ENGINEER)
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .igs file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.