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Convert STEP to IGES Online: STP to IGS Exchange

Convert STEP/STP models to IGES online. The IGES result is geometry exchange and does not guarantee the original assembly structure or solids.

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Capabilities and limits

  • Convert STEP/STP models to IGES online. The IGES result is geometry exchange and does not guarantee the original assembly structure or solids.
  • 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 STEP or STP model to IGES when a receiver still requires IGS. Check the result: IGES may represent the shape as surfaces rather than as the same solid assembly.

Start from the STEP file you intend to send

Open the STEP model and confirm units, bodies and component scope before converting. Converting a partial or wrong revision only produces another copy of that input.

Convert STEP to IGES

Choose IGES as the output and download the file. The result is for geometry exchange. It does not promise that assembly structure, solid topology or product manufacturing information will survive.

Reopen the IGES before you send it

Check one known dimension and whether the receiver needed solids or can accept surfaces. An IGES file of open shells will not provide a reliable volume.

Input formats: STEP / STP

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.

No public screenshot is shown for this conversion until a successful export has been reopened and checked. Verify one known dimension and the receiver's solid or surface requirement before sending the IGES file.

Sample source and verification

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/step-to-iges/

A reproducible example

Convert the generated 20 × 30 × 40 mm STEP block to IGES. Reopen the IGES result and check the envelope and surface representation before exchanging it.

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 STEP to IGES online?

Yes. Upload a STEP or STP file, choose IGES and download the converted file.

Will IGES keep my STEP assembly as solids?

Not necessarily. IGES is a surface-oriented exchange format. Assembly structure and closed solids are not guaranteed in the output.

Should I use IGES instead of STEP?

Use IGES when the receiving process asks for it. For a new handoff, STEP is usually the clearer neutral format. Confirm the requirement before converting.

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 →Opening files

STEP File (.step, .stp): What It Is and How to Open It

A STEP file is a neutral ISO 10303 CAD model saved as plain text. See what it contains, how to open a .step or .stp file online, and what to check first.

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 →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 →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 →