Free under 5 MBOBJ → IGESNo software installation

Convert OBJ to IGES online

Convert an OBJ (.obj) mesh to IGES (.iges or .igs) for legacy CAD/CAM and surface-exchange workflows. The output is derived from polygon faces; it does not restore smooth NURBS surfaces, native features, textures or design history.

Encrypted uploads Files up to 300 MB Automatically deleted within 7 days

Upload your OBJ file

Choose one OBJ file. This page is already configured to create IGES output.

Secure

Drag and drop your OBJ file here

or choose a file from your computer

Browse files

Maximum file size: 300 MB

Files under 5 MB convert and download free. Larger files use one credit for one completed download, regardless of file size.

No OBJ file available? Try a OBJ sample to see the workflow.

Pricing

Pay as you go, cheaper by the pack

Files under 5 MB convert and download free. Larger files use one credit for one completed download, regardless of file size. 1 credit downloads any file, any size, and credits never expire.

Starter

3credits

$7.99

$2.66 each

Save 11%

3 downloads of any size. Good for a one-off project.

Pro

5credits

$12.99

$2.60 each

Save 13%

5 downloads of any size. The everyday choice.

★ Most popular

Team

10credits

$19.99

$2.00 each

Save 33%

10 downloads of any size. Best balance of price and volume.

Studio

15credits

$26.99

$1.80 each

Save 40% · best value

15 downloads of any size. Lowest price per file.

Just need one? Pay $2.99 for a single downloadNo subscriptionCredits never expireInvoice on every purchase

No desktop software

Start the OBJ-to-IGES workflow in your browser without installing a CAD application or plugin.

Honest mesh-to-surface output

The IGES result packages geometry derived from OBJ polygons. It is not a reverse-engineered parametric CAD model.

Ready to inspect

Open the result in an IGES-compatible viewer or CAD/CAM application and check scale, surface count, gaps and file complexity.

Open IGES viewer

Private file handling

Files stay private, are never added to the public CAD library and are automatically deleted within 7 days.

Continue your CAD workflow

Inspect the OBJ, verify the IGES or request specialist help

Inspect the OBJ mesh first, validate the IGES surfaces after conversion, or request reverse engineering when clean analytic surfaces are required.

Check the source OBJCheck for missing faces, inverted normals, disconnected objects, non-manifold edges and excessive polygon density.Open OBJ viewerInspect the IGES outputConfirm that the .iges or .igs file opens at the expected size and contains the expected entities or surface patches.Open IGES viewerNeed smooth CAD surfaces?Ask a CAD designer to rebuild planes, cylinders, fillets and NURBS surfaces when a faceted IGES result is not suitable.Hire a CAD designer

Simple conversion workflow

How to convert OBJ to IGES online

Move from a Wavefront OBJ mesh to an IGES-compatible surface model in three steps.

01

Upload the OBJ file

Choose a .obj file up to 300 MB. Repair invalid polygons and confirm the intended scale before converting.

02

Convert to IGES

The route is preconfigured for IGES. Start the conversion without searching through a destination-format menu.

03

Download and verify

Open the .iges or .igs result in the receiving system. Verify dimensions, surface orientation, gaps and usable entity structure.

Convert OBJ to IGES

Format behaviour

What actually happens when OBJ is converted to IGES?

OBJ stores polygonal geometry and may reference MTL materials, texture images, UV coordinates and object groups. IGES stores curves, wireframes and trimmed surfaces. Conversion translates the visible mesh geometry into IGES-compatible entities—often many faceted surface patches. It cannot infer the original smooth surfaces or parametric design intent.

What is normally retained

  • Visible shape defined by OBJ polygons
  • Vertex and face geometry
  • Model orientation
  • Separate objects or shells where supported
  • Closed geometry only when the source mesh is suitable

What is not retained or may change

  • MTL materials, texture images and UV mapping
  • Original sketches, constraints and feature history
  • Exact analytic or NURBS surfaces
  • Reliable physical units when none were supplied
  • Some object names, groups and smoothing data
Wavefront OBJOBJ
IGES modelIGES

Format comparison

OBJ versus IGES

Choose the format according to what the next application needs—not because one is universally better.

FeatureOBJ OBJIGES IGES
Data modelPolygon meshCurves, wireframes and trimmed surfaces
Visual dataMay use MTL, textures and UVsNot designed for modern texture workflows
UnitsNo universal unit conventionCan carry unit metadata, but verify import interpretation
EditabilityMesh and vertex editingSurface/entity editing; no recovered feature tree
Best useVisualization, scanning and asset exchangeLegacy CAD/CAM and surface exchange

Choose IGES when

A supplier or application specifically requires IGES

You need a surface-exchange container for legacy CAD/CAM

You can accept faceted geometry derived from the mesh

You will verify the result before manufacturing

Keep OBJ when

Materials, textures or UVs matter

The next step is rendering or mesh editing

You need to preserve polygon groups or smoothing data

A faceted IGES offers no downstream advantage

Before continuing

Check the converted IGES before using it

OBJ and IGES represent different types of data. Review the output carefully before quoting, machining or continuing surface work.

  1. 01

    Verify dimensions and unit interpretation

    OBJ does not enforce a universal physical unit. Measure a known feature in the IGES result.

  2. 02

    Inspect surface count and complexity

    Dense meshes can create thousands of IGES entities and slow the receiving application.

  3. 03

    Check open edges and gaps

    Look for disconnected patches, overlaps, missing polygons and boundaries that failed to translate.

  4. 04

    Review orientation and normals

    Confirm that faces are not reversed and the model displays consistently.

  5. 05

    Confirm lost visual data

    Check whether materials, colors, textures and UVs are required elsewhere; keep the original OBJ and assets.

  6. 06

    Open the target application

    Test the file in the exact CAD or CAM system used next.

Common problems

OBJ-to-IGES troubleshooting

Most issues come from invalid polygons, missing unit context, dense meshes or expecting IGES to preserve OBJ visual assets.

The IGES file is huge or slow

Cause: Each polygon may become one or more surface entities.

Fix: Create a copy of the OBJ and decimate non-critical detail before retrying.

Textures or materials disappeared

Cause: IGES does not preserve the OBJ/MTL texture workflow.

Fix: Keep the OBJ, MTL and image files as the visual source of truth.

The model is the wrong size

Cause: The source unit was implicit or interpreted differently.

Fix: Measure a known feature and apply the intended unit or scale.

Faces are missing or reversed

Cause: The OBJ contains invalid polygons, open edges or inconsistent normals.

Fix: Repair topology and recalculate normals before conversion.

The result is not a smooth CAD model

Cause: Format conversion follows the mesh facets.

Fix: Use reverse engineering when analytic surfaces are required.

The file fails in the receiving system

Cause: It may exceed entity limits or contain unsupported geometry.

Fix: Simplify the source and test a smaller sample; request specialist help if needed.

Hire a CAD designer

Secure processing

Your design files remain yours

Engineering files can contain confidential geometry and documentation. Marathon OS keeps conversion uploads separate from its public CAD library and explains how each file is handled.

Encrypted transfer

Files are transferred over an encrypted connection.

Automatic deletion

Uploaded source files and converted outputs are automatically deleted within 7 days.

You retain ownership

Uploading or converting a file does not transfer ownership of the design to Marathon OS.

Never published automatically

Conversion files are not listed in the public Marathon OS CAD library.

Use tools that support the same OBJ-to-IGES workflow.

OBJ

OBJ file viewer

inspect the source mesh

IGES

IGES file viewer

verify the converted surfaces

OBJSTEP

OBJ to STEP

create a STEP-compatible mesh-derived output

OBJBREP

OBJ to BREP

try a topology-based CAD container

IGESSTEP

IGES to STEP

move legacy surfaces into STEP

CAD

Hire a CAD designer

rebuild clean native geometry

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STEPSTL

STEP to STL

CAD to printable mesh

STLSTEP

STL to STEP

mesh to CAD exchange

OBJSTEP

OBJ to STEP

mesh to CAD exchange

STEPIGES

STEP to IGES

legacy surface exchange

3DMSTEP

3DM to STEP

Rhino to CAD/CAM exchange

IGESSTEP

IGES to STEP

legacy surfaces to STEP

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Frequently asked questions

Frequently asked questions about OBJ to IGES conversion

Clear answers about output behavior, compatibility, pricing, file limits and privacy.

  • How do I convert OBJ to IGES online?

    Upload OBJ (.obj), confirm IGES as the preselected output, convert and download IGES (.iges, .igs). Verify the result in the target application.

  • Why convert OBJ to IGES?

    Use IGES when a legacy CAD/CAM system or supplier requires .igs or .iges and the mesh-derived geometry is acceptable.

  • Does OBJ to IGES create smooth NURBS surfaces?

    No. Automatic conversion translates the polygon mesh into IGES-compatible entities. It does not reliably reconstruct original analytic or NURBS surfaces.

  • Which OBJ and IGES extensions are supported?

    This route accepts .obj input and creates .iges, .igs output.

  • Is the OBJ to IGES converter free?

    Files under 5 MB can be converted and downloaded free. Larger files use one credit for one completed download.

  • What is the maximum OBJ file size?

    You can upload a OBJ file up to 300 MB. High polygon counts can produce very large IGES files and long import times.

  • How are my files handled?

    Files are transferred securely, are not published to the public CAD library and are automatically deleted within 7 days. You retain ownership.

Need a clean, editable CAD model?

Changing OBJ into IGES does not recreate design intent. Use a vetted CAD designer when the job requires smooth surfaces, tolerances or production-ready native geometry.

Hire a CAD designerConvert another OBJ file