Convert SLDPRT
to IGES.

Updated 2026-10-19

To convert SLDPRT (.sldprt) to IGES (.iges / .igs), drop the file below and download the result, in the browser with nothing installed. Most parts come through on their own surfaces: planes stay planes and holes stay cylinders.

2 solid-geometry conversions a day with no account. No card, no install, no CAD licence.

No account needed
Drop a SLDPRT file.sldprt · up to 200 MB

On our servers. No account: deleted within 24 hours. Signed in: kept until you delete them. Never shared or used for training.

ResultUsually true surfaces

A closed IGES solid that Fusion 360, Inventor, Onshape, SOLIDWORKS, Creo and FreeCAD open directly and a machine shop can quote from. Radii measure and faces mate like modelled geometry. Where those surfaces cannot be read, or cannot be written out exactly, they are rebuilt from the display geometry, and failing that the body is faceted; every conversion says which of the three.

No feature history: you get the finished shape, not the steps that built it.

HowThree steps
  1. Drop your .sldprt file above — up to 200 MB without an account.
  2. IGES is already selected as the output.
  3. Download the .iges. Without an account, files are deleted within 24 hours; signed in, they are kept until you delete them.
FormatsWhat you are holding

SOLIDWORKS part file (.sldprt)

A SLDPRT file is a single SOLIDWORKS part: the exact solid — true planes, cylinders and splines — plus its feature history, sketches, material and custom properties. It is proprietary, so nothing else on your machine may open it. Assemblies are SLDASM files. One SLDPRT can hold several bodies, and those should stay separate when converting.

You were sent a SLDPRT, do not have SOLIDWORKS, and need the geometry in something your CAD system, slicer or mesher opens.

IGES file (Initial Graphics Exchange Specification) (.iges / .igs)

IGES predates STEP and is still requested by older CAM systems and mould and die workflows. It stores exact geometry, but many IGES files are loose trimmed surfaces that never close into a watertight solid. Unless someone asks for IGES by name, STEP is the better choice.

A CAM programmer, toolmaker or legacy system asked for IGES, or you were handed one and need something current.

Questions9 answered
Is the SLDPRT to IGES converter free?
Yes. 2 solid-geometry conversions a day with no account, of 5 in total. A free account converts 4 solid files a day and adds 25 credits. No card.
Do I need SOLIDWORKS to convert a SLDPRT file?
No. The file opens and converts in the browser with nothing installed and no CAD licence.
Will the IGES file keep exact curves and holes?
Most parts come through on their own surfaces: planes stay planes and holes stay cylinders. A closed IGES solid that Fusion 360, Inventor, Onshape, SOLIDWORKS, Creo and FreeCAD open directly and a machine shop can quote from. Radii measure and faces mate like modelled geometry. Where those surfaces cannot be read, or cannot be written out exactly, they are rebuilt from the display geometry, and failing that the body is faceted; every conversion says which of the three. No feature history: you get the finished shape, not the steps that built it.
Will the IGES file open in Fusion 360, Inventor or Onshape?
Yes. IGES is read directly by Fusion 360, Inventor, Onshape, SOLIDWORKS, Creo, NX and FreeCAD. It arrives as a solid body you can measure, mate and cut.
What happens to a multibody part?
Bodies stay separate and keep their names.
Should I use IGES or STEP?
STEP, unless a CAM system or toolmaker asks for IGES by name. Both carry exact geometry, but STEP is the current ISO standard and closes into a solid more reliably.
How big a file can I convert?
To a mesh format like STL: 300 MB with a free account, 200 MB without one. To STEP, Parasolid or SLDPRT: 140 MB, because rebuilding a solid takes about twice the memory of writing a mesh. Maker and Studio convert up to 830 MB and 380 MB — a large conversion on a paid plan gets the server to itself.
Is it safe to upload my SLDPRT file?
Files travel encrypted and are processed by machine on our own servers — no third parties, no ads or trackers, no AI training.
Is my SLDPRT file deleted after converting?
Without an account, the upload and the result are deleted within 24 hours. With an account, both stay in your files until you delete them; deleted files leave our servers within 24 hours.
Beyond convertingSame file, four workspaces

Keep the part open: fill it with a lattice, check it with FEA, texture a surface, or slice it into cut-ready sheets. These workspaces are in early access — create an account, then apply from inside the app.

Create free account See pricing

AlsoOther ways in
MoreRelated conversions

Going the other way? Convert IGES to SLDPRT.

Need it in an older SolidWorks? Save a part for an older release.

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