Convert IGES or IGS to OBJ online

Upload your .iges or .igs file to the converter at the top of this page and download one OBJ mesh in millimetres. FreeCAD, which is free, can also open an IGES and export OBJ. Marathon OS is the paid route if you don't have CAD at hand: first 2 files free, then 1 credit per file.

First 2 files free, any size up to 300 MB. After that, 1 credit per file. Credit packs bring it down to $1.80 per file. Prices include tax, you pay only when you click Download and credits never expire.

Yes. .igs is the short extension for IGES; both convert the same way.

OBJ files don't store units. Ours is written in millimetres, and Blender reads 1 unit as 1 metre. Set Scale to 0.001 in Blender's OBJ importer, or scale the object after import.

No. You get one .obj file with no .mtl material file, so IGES colours don't carry over. Assign materials in your 3D tool after import. If you need separate parts, IGES to 3MF writes one object per solid and can carry a display colour for each.

Every part keeps its assembled position, but the OBJ holds them as one mesh object without part names. In Blender, Separate › By Loose Parts splits it into pieces.

Every IGES is meshed at a 1.0 mm chord tolerance and about 29° between neighbouring triangles. On files under 20,000 faces and 200 solids, a part that doesn't come out closed is meshed again finer, down to 0.1 mm. Meshes over 100,000 triangles are reduced to about 100,000, unless that would open the mesh or change its size. There are no quality presets.

Yes, two ways. Export the mesh from your CAD program at a smaller deviation; FreeCAD, which is free, opens IGES files. Or convert IGES to STEP first: our STEP to OBJ converter meshes at a 0.15 mm chord tolerance. That's two conversions.

Meshes over 100,000 triangles are already reduced to about 100,000. To go lower, decimate after import, for example with Blender's Decimate modifier.

It still converts. Trimmed surfaces are meshed and their edges welded, but gaps between surfaces can leave the mesh open. For surface-only files, the quality report marks the solid and watertight checks as not applicable, so check the mesh before you print it.

Yes. Every conversion comes with a free quality report with 12 checks, including whether the mesh is watertight, degenerate triangles, mesh uniformity, a bounding-box match with the IGES and how much of the surface the mesh covers. For a surface-only IGES, the solid and watertight checks are marked not applicable.

Yes. Our OBJ to IGES conversion rebuilds an IGES file from the mesh. Curved areas may stay faceted, and there's no feature tree. Keep your original IGES if you will need the exact geometry.

IGES files from any CAD program, as .iges or .igs, up to 300 MB. We read both solids (type 186) and trimmed surfaces (type 144). Files that use commas as decimal points, which some SolidWorks setups write, are fixed before reading.

To upload your own file, sign in with Google or an emailed code. The sample file works without signing in.

It depends on the file. Large assemblies can take several minutes, and we email you when the file is ready.

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