.igs files from older CAD systems need to become STL before a slicer or mesh tool can use them. This converter runs entirely in your browser: the file is processed on your own device and never uploaded.
Why convert IGS to STL?
.igs files from older CAD systems need to become STL before a slicer or mesh tool can use them.
How it works
Drop your .igs file above and download the .stl. The conversion engine (Open CASCADE, compiled to WebAssembly) runs inside the page, so it works the same on Windows, macOS, Linux and ChromeOS without installing anything.
IGS vs STL
IGS (IGES file): IGS is the short extension for IGES files. The format is the same: CAD surfaces, curves and sometimes solids in the 1980s US exchange standard. Used by: Older CAD/CAM pipelines and supplier archives.
STL (stereolithography): STL, introduced in 1987 for 3D Systems’ stereolithography machines, describes a surface only as a list of triangles. It carries no colour, no materials and no units. Used by: Every 3D-printing slicer — Cura, PrusaSlicer, Bambu Studio, Chitubox — and model sites like Printables and Thingiverse.
Quality notes
STEP and IGES describe exact curved surfaces; STL and OBJ can only hold triangles. The converter tessellates every surface into a triangle mesh, so a perfect cylinder becomes many flat facets. The feature history, parametric dimensions and assembly metadata do not survive — only the shape does. Like any IGES data, an .igs made of loose surfaces can give a mesh with gaps that needs repair before printing.
Common use cases
Printing legacy parts; importing old tooling data into mesh software.
Frequently asked questions
Is IGS the same as IGES?＋
Yes — .igs is the short extension for IGES.
Will it print?＋
Closed solids print directly. Open surfaces need a repair pass in your slicer.
Is my model private?＋
Yes. It is processed in your browser and never uploaded.
Can I get OBJ instead?＋
Yes, the IGES to OBJ converter produces a mesh for render tools.