# 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.

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.

## 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.

## 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

### 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 guides

- [IGES Surfaces Not Solid? Check Volume and Open Shells](https://www.cadprops.com/guides/iges-surfaces-not-solid/index.md)
- [STEP vs IGES: Which CAD Exchange Format Fits the Job?](https://www.cadprops.com/guides/step-vs-iges/index.md)
- [CAD File Conversion Checklist: Units, Solids & Accuracy](https://www.cadprops.com/guides/cad-conversion-checklist/index.md)

## Related tools

- [IGES / IGS viewer](https://www.cadprops.com/tools/iges-viewer/index.md)
- [STEP viewer](https://www.cadprops.com/tools/step-viewer/index.md)
- [Volume calculator](https://www.cadprops.com/tools/cad-volume-calculator/index.md)

HTML page: https://www.cadprops.com/tools/iges-to-step/