Convert STEP to IGES Online
Convert STEP to IGES in seconds. STEP is the ISO 10303 CAD exchange standard; IGES's strength is this: still widely supported across older and current CAD software alike. No software installation required — everything runs in your browser.
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Why Convert STEP to IGES?
IGES was built around exchanging exact surface/curve geometry between legacy CAD systems, which is precisely the gap STEP leaves open, since it's designed around exact engineering geometry exchange between CAD systems and manufacturers instead.
If you need a file built for exchanging exact surface/curve geometry between legacy CAD systems but only have one built for exact engineering geometry exchange between CAD systems and manufacturers, converting is usually the fastest path — STEP and IGES serve different enough purposes that recreating the asset from scratch rarely makes sense.
The short version: STEP is optimized for exact engineering geometry exchange between CAD systems and manufacturers, IGES is optimized for exchanging exact surface/curve geometry between legacy CAD systems, and this converter exists for the moment those two needs don't line up.
How conversion works
- Upload your STEP file.
- MiConvert converts it to IGES, aiming to preserve what makes IGES useful: still widely supported across older and current CAD software alike.
- Download the converted IGES file.
- Use it directly with most CAD systems.
Key Conversion Features
- Built to handle the real-world quirks of files meant for exact engineering geometry exchange between CAD systems and manufacturers, not just a textbook version of the format
- Purpose-built for the shift from exact engineering geometry exchange between CAD systems and manufacturers to exchanging exact surface/curve geometry between legacy CAD systems, not a generic pass-through
- Converts STEP into IGES, aiming to preserve what matters most: still widely supported across older and current CAD software alike
- Free for files up to 50MB, 100MB for registered accounts
- Understands that STEP is the ISO 10303 CAD exchange standard and IGES is an older CAD surface and curve exchange standard, rather than treating the conversion as a blind format swap
Video Tutorial
Looking for a quick and free way to convert STEP to IGES? In this tutorial, we show you exactly how to change your STEP files into IGES format in just a few seconds without installing any software! �
Frequently Asked Questions
Why does IGES exist as a separate format instead of everyone just using STEP?
Because they're built for different jobs — STEP is aimed at exact engineering geometry exchange between CAD systems and manufacturers, while IGES is aimed at exchanging exact surface/curve geometry between legacy CAD systems. Neither format is "better," they just fit different parts of a workflow.
What software works with the converted IGES file?
IGES is used by most CAD systems. If you were working with SolidWorks, Fusion 360, Inventor, CATIA (which produces STEP), this conversion is the direct bridge between the two.
Do I need SolidWorks, Fusion 360, Inventor, CATIA installed to convert my file?
No — the conversion happens entirely on our servers. You don't need SolidWorks, Fusion 360, Inventor, CATIA, and you don't need most CAD systems either unless you plan to open or edit the IGES result afterward.
Is IGES objectively better than STEP?
Not objectively — IGES is better specifically for exchanging exact surface/curve geometry between legacy CAD systems. For exact engineering geometry exchange between CAD systems and manufacturers, STEP is still the right tool; that's exactly why both formats exist.
Can I convert the file back from IGES to STEP afterward?
Only what IGES actually carries can come back — anything specific to STEP's role in exact engineering geometry exchange between CAD systems and manufacturers that didn't survive the original conversion won't reappear.