Convert IGES to STEP Online
Convert IGES to STEP in seconds. IGES is an older CAD surface and curve exchange 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 IGES to STEP?
IGES is an older CAD surface and curve exchange standard, commonly used for exchanging exact surface/curve geometry between legacy CAD systems. That focus comes with a real limitation: represents a model as separate trimmed surface patches, not a unified solid. STEP doesn't share that problem — its strength: true B-rep geometry — exact surfaces and curves, not an approximation.
IGES's limitation: represents a model as separate trimmed surface patches, not a unified solid. STEP's strength: true B-rep geometry — exact surfaces and curves, not an approximation — it doesn't share that constraint.
IGES is typically produced by or used with most CAD systems, for exchanging exact surface/curve geometry between legacy CAD systems. STEP is expected by SolidWorks, Fusion 360, Inventor, CATIA instead, for exact engineering geometry exchange between CAD systems and manufacturers — converting bridges that gap.
How conversion works
- Upload your IGES 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
- Fast turnaround, typically under a minute per file
- 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
- Converts IGES into STEP, aiming to preserve what matters most: true B-rep geometry — exact surfaces and curves, not an approximation
Video Tutorial
Learn how to effortlessly convert IGES to STEP online for free. This video guides you step-by-step through the process of using the best IGES to STEP converter available. 🔗 Start converting here: ht
Frequently Asked Questions
Is there a file size limit for this conversion?
Free conversions handle files up to 50MB; registered accounts get up to 100MB.
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 this conversion free?
Yes — free for files up to 50MB, with a 100MB limit for registered accounts, no subscription required.
Can I convert the file back from STEP to IGES afterward?
Only what STEP actually carries can come back — anything specific to IGES's role in exchanging exact surface/curve geometry between legacy CAD systems that didn't survive the original conversion won't reappear.
Do I need any special settings before uploading my IGES file?
No special setup is required — upload the file as-is. IGES files meant for exchanging exact surface/curve geometry between legacy CAD systems convert most predictably; unusually exported or non-standard files are the most common reason a specific one might need extra attention.