Convert IGS to STEP Online
Convert IGS to STEP in seconds. IGS (IGES) is the 3-letter extension for the IGES CAD standard; STEP's strength is this: true B-rep geometry — exact surfaces and curves, not an approximation. No software installation required — everything runs in your browser.
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Why Convert IGS to STEP?
If you need a file built for exact engineering geometry exchange between CAD systems and manufacturers but only have one built for exchanging exact surface/curve geometry between legacy CAD systems, converting is usually the fastest path — IGS (IGES) and STEP serve different enough purposes that recreating the asset from scratch rarely makes sense.
The short version: IGS (IGES) is optimized for exchanging exact surface/curve geometry between legacy CAD systems, STEP is optimized for exact engineering geometry exchange between CAD systems and manufacturers, and this converter exists for the moment those two needs don't line up.
STEP was built around exact engineering geometry exchange between CAD systems and manufacturers, which is precisely the gap IGS (IGES) leaves open, since it's designed around exchanging exact surface/curve geometry between legacy CAD systems instead.
How to Convert IGS to STEP
- Upload your IGS file.
- MiConvert converts it to STEP, aiming to preserve what makes STEP useful: true B-rep geometry — exact surfaces and curves, not an approximation.
- Download the converted STEP file.
- Use it directly with SolidWorks, Fusion 360, Inventor, CATIA.
Key Conversion Features
- No local software installation required for either side — not most CAD systems, not SolidWorks, Fusion 360, Inventor, CATIA — everything runs in the cloud
- Produces output ready for SolidWorks, Fusion 360, Inventor, CATIA, picking up right where most CAD systems left off
- Built to handle the real-world quirks of files meant for exchanging exact surface/curve geometry between legacy CAD systems, not just a textbook version of the format
- Free for files up to 50MB, 100MB for registered accounts
- Understands that IGS is the 3-letter extension for the IGES CAD standard and STEP is the ISO 10303 CAD exchange standard, rather than treating the conversion as a blind format swap
Video Tutorial
An A-Z video guide on how to use MiConvert to change IGS format to STEP. This is the safest method to convert data without needing to download any applications to your device. 🔗 Format conversion to
Frequently Asked Questions
Why would I need STEP instead of just keeping IGS?
Mainly when your workflow specifically calls for exact engineering geometry exchange between CAD systems and manufacturers — that's STEP's whole reason for existing, and IGS (IGES) isn't built to provide it, since it's focused on exchanging exact surface/curve geometry between legacy CAD systems instead.
Is the conversion from IGS to STEP reliable?
Straightforward files convert reliably. IGS (IGES)'s limitation — represents a model as separate trimmed surface patches, not a unified solid — combined with STEP expecting exact engineering geometry exchange between CAD systems and manufacturers, means unusual or edge-case source files can occasionally need a second look.
Do I need most CAD systems installed to convert my file?
No — the conversion happens entirely on our servers. You don't need most CAD systems, and you don't need SolidWorks, Fusion 360, Inventor, CATIA either unless you plan to open or edit the STEP result afterward.
Is there a file size limit for this conversion?
Free conversions handle files up to 50MB; registered accounts get up to 100MB.
Will I lose anything converting IGS to STEP?
Converting to STEP means adapting to a real constraint: not readable by mesh-only tools like slicers without conversion. Anything IGS (IGES) carries — built as it is for exchanging exact surface/curve geometry between legacy CAD systems — that has no equivalent there won't make the trip, but the core content converts faithfully.