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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.

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Capabilities and limits

  • Convert IGES/IGS files to STEP online. Open surfaces stay surfaces; volume is available only when the source is a closed solid.
  • Conversion preserves supported geometry rather than native parametric feature history; verify output units, completeness and geometry.
  • Files are uploaded for server processing; support depends on format, version and geometry.
  • Viewing and measuring do not require an account. Free conversion points are valid for 90 days. Sign in to convert, save files across devices or create share links.
On this page

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.

Input formats: IGES / IGS

Points: viewing and measuring are free. A new account gets 3 free conversion points; free points are valid for 90 days. One point converts one file to every output format for 30 days, and a failed or incomplete conversion uses none. See pricing.

Open this tool

General steps for uploading, viewing, sectioning, measuring, converting and exporting are explained once in How it works. This page covers what is specific to this file type.

Real CADProps screenshots

The screenshots show the English interface. Captions and instructions describe the same operations.

Convert CAD files — box.iges
Convert CAD files — box.iges

Sample source and verification

Properties — iges-to-step.stp · 10 × 20 × 30 mm · 6,000 mm³ · 2,200 mm²
Properties — iges-to-step.stp · 10 × 20 × 30 mm · 6,000 mm³ · 2,200 mm²

When a result needs another check

Viewing can start without an account. Conversion, account storage and share creation require signing in. Temporary files expire after the displayed retention period. Read the privacy statement for server processing and deletion, and the accuracy notes before using numerical results. Do not assume that hiding a part, clipping it or exploding an assembly changes the exported source geometry.

When a result needs another check · Input formats

Continue with a related task

Original article: CADProps · https://www.cadprops.com/tools/iges-to-step/

A reproducible example

Convert a generated IGES block with 20 × 30 × 40 mm envelope to STEP. Reopen the result and verify the solid status, dimensions and 24,000 mm³ volume.

Repository-generated samples are synthetic test models. Verify your own model's units and geometry before using results.

Supported formats
All formats and limits →

Questions about this task

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.

Do I need an account to convert files?

View and measure without an account. Register or sign in to convert, save files and create share links. Recipients can view shared models without an account.

Related reading

Checks that help with this file.

All guides →
Opening files

IGES File (.igs, .iges): What It Is and How to Open It

An IGES file is an older neutral CAD format for curves, surfaces and some solids. Learn how to open an .igs or .iges file online and check what you received.

Read the guide →Troubleshooting

IGES 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 formats

STEP 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 →Conversion

CAD 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 →