How to convert STP to IGS
- Add your .STP file - drop it in the box above or click to browse.
- Convert it to .IGS in a few seconds.
- Download your new .IGS file.
What to expect
- IGES has no standard assembly structure, so multi-part STP assemblies may be flattened or merged in the output
.igsfile. - IGES is a frozen standard (last revised 1996); if the receiving system accepts both formats, STEP is the better long-term choice.
- IGS files are often larger than equivalent STP files because the format uses fixed 80-character columns, a carry-over from punched-card era encoding.
Frequently asked questions
Will the assembly structure survive the conversion?
Probably not fully. IGES has no standard way to represent multi-part assemblies, so parts may be merged or saved as separate files - check the output before sending it to a supplier.
Is `.igs` the same as `.iges`?
Yes -
.igs is the three-letter abbreviation and .iges is the full extension; the file format and content are identical.Why does my supplier ask for IGS instead of STEP?
Their CAM software or CNC controller predates STEP becoming dominant and only accepts IGES. Newer systems almost always accept both.
Can I convert STP to IGS for free?
Yes - the converter on this page is free, and desktop tools like FreeCAD and CAD Assistant are also free and handle the conversion without limitations.
Programs that convert STP: SolidWorks · CATIA · AutoCAD · 3D Object Converter · Argon · CrossManager · IronCAD · TurboCAD
