Confirm the IGES is the intended model
Open the IGES file and check that the expected surfaces or solids loaded. An IGES extension does not say whether the file is a closed solid, a set of faces or a trimmed surface model.
CADProps · CAD tools
IGES to STEP Converter Online: IGS/IGES to STP
Convert IGES/IGS files to STEP online. Open surfaces stay surfaces; volume is available only when the source is a closed solid.
No account required
Temporary workspaceCAD processingBefore you use the result
Know what you are looking at.
Convert a supported IGES or IGS file to STEP. Inspect the source first: many IGES files are open surfaces, and conversion does not close them into a solid.
Convert IGES to STEP
Choose STEP as the output and download the result. The conversion exchanges the geometry that could be read. It does not invent a feature tree, and it does not sew open shells into a solid.
Read volume only for closed solids
Dimensions and surface area can be available for open shells. Volume and any density-based mass require a valid closed solid. If the IGES was surfaces, the STEP result can still be surfaces.
Questions about this task
Know the limits.
Can I convert IGES to STEP online?
Yes, for supported IGES and IGS files. Upload the file, choose STEP and download the converted geometry.
Will an open IGES surface become a solid STEP file?
No. Open shells stay open. Volume is reported only when the geometry is a valid closed solid.
Does the STEP file keep the IGES feature history?
No. Both formats exchange geometry. The conversion does not recreate a parametric feature tree.
Related reading
Checks that help with this file.
ConversionCAD File Conversion Checklist: Units, Solids & Accuracy
Reopen the output, verify scope and units, inspect critical geometry, and include a short record of what was and was not checked.
Read the guide →
TroubleshootingIGES Surfaces Not Solid? Check Volume and Open Shells
Understand an IGES surface import before stitching boundaries or assuming the reader failed to create a solid.
Read the guide →
File formatsSTEP vs IGES: Which CAD Exchange Format Fits the Job?
Compare STEP and IGES for CAD handoffs, solids, surfaces, assemblies and downstream verification without assuming one file extension guarantees a perfect transfer.
Read the guide →