What is a .IGS file?
IGS is the same older CAD exchange format as IGES, for 3D models and surfaces.
- Did you know
- IGS is IGES under its short extension - the first widely used CAD exchange format, from 1980.
- IGS and IGES are the same vendor-neutral CAD exchange format, just written with the short three-letter extension.
- The format stores geometry as plain readable ASCII text divided into rigid 80-column record sections.
- It can describe wireframe curves, trimmed surfaces and annotations, which is why it long outlived its 1980s origins.
- Modern CAD has largely shifted to the newer STEP standard, but IGS remains common for legacy surface data.
- What Analyser shows you
- View STL, OBJ, PLY, OFF, STEP, IGES, BREP, 3MF and AMF models in an interactive WebGL viewer with triangle count, bounding box, surface area and volume. STEP/IGES/BREP are tessellated with OpenCASCADE and STEP shows its originating CAD system, version and AP203/214/242 protocol; 3MF and AMF let you inspect each model and assembly on the build plate individually.
- Open a .IGS file
- Drag a .IGS file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.