How to convert STEP to IGES
- Add your .STEP file - drop it in the box above or click to browse.
- Convert it to .IGES in a few seconds.
- Download your new .IGES file.
What to expect
- Both STEP and IGES store exact B-rep geometry, not triangle meshes - but complex trimmed NURBS surfaces may not translate perfectly; open the result in the receiving software and check for missing faces or gaps.
- IGES lacks STEP’s support for assemblies, tolerances, and product metadata; if the receiving system accepts STEP, use STEP instead.
.igsand.igesare the same format - the file content is identical, only the extension differs.
Frequently asked questions
Is any geometry quality lost when converting STEP to IGES?
Not in the way mesh conversion loses quality. Both formats store exact surfaces, but subtle differences in trimmed NURBS representation can create minor gaps in complex models - always verify the result.
Can I convert IGES back to STEP?
Yes - open the
.igs file in FreeCAD or Fusion 360 and export as STEP. The same surface fidelity caveats apply.What is the difference between `.igs` and `.iges`?
They are the same format.
.igs is the older three-letter extension; .iges is the full extension. CAD software treats them identically.Why does the receiving system want IGES rather than STEP?
IGES dates to 1980 and is supported by legacy CAD, CAM, and CNC tools never updated to read STEP. When the receiving system accepts both, STEP is preferable.
Programs that convert STEP: AutoCAD · SolidWorks · 3D Object Converter · Argon · Creo Parametric · 3ds Max (3D Studio Max) · Alibre Design Professional · Autoconverter
