Convert IGES
to Parasolid.

Updated 2026-10-06

To convert IGES to Parasolid, drop the .iges or .igs file into the converter below and download an .x_t. The exact surfaces in the IGES are rebuilt as the same true surfaces in the transmit file, ready for SOLIDWORKS, Solid Edge or NX. No account is needed for up to 2 solid conversions a day. If the sender can export STEP or Parasolid directly, that is always the cleaner source.

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

No account needed
Drop a IGES file.iges / .igs · up to 200 MB
Several bodies

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

ResultTrue surfaces

Planes stay planes and cylinders stay cylinders: a hole comes through as one face with a radius you can measure and mate to.

Unsupported geometry is refused with a message naming it, never silently degraded.

ChangesIGES → Parasolid

What changes between IGES and Parasolid

IGES and Parasolid both store exact geometry, so planes, cylinders and NURBS surfaces carry over as themselves and no dimension moves.

The difference is what the file promises about those surfaces. A Parasolid transmit file is a solid: faces joined edge to edge into a closed body. An IGES is often only a set of trimmed surfaces that happen to sit next to each other, written by a system that never joined them, and sometimes with small gaps between them. When the IGES describes a closed body, the .x_t is a solid. When it is loose surfaces with gaps, the conversion cannot invent the missing edges, and the result may be refused or open, so ask for a STEP or Parasolid export instead.

Nothing beyond geometry travels: IGES files carry no feature history, and colours, levels and attributes are not carried into the .x_t.

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

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.

Parasolid transmit file (.x_t / .x_b)

Parasolid is the modelling kernel under SOLIDWORKS, Solid Edge and NX, and a transmit file is its exact solid geometry. Between systems that share the kernel it often survives better than a neutral format. .x_t is text, .x_b is binary; both hold the same solid.

Someone in a Siemens or SOLIDWORKS shop sent you an .x_t and nothing you have opens it.

Questions10 answered
How do I convert IGS to x_t?
Drop the .igs (or .iges; they are the same format) on this page, where Parasolid is already selected, and download the .x_t.
Do I get an .x_t or an .x_b?
An .x_t, the text encoding, which is what SOLIDWORKS, Solid Edge and NX users usually exchange. The binary .x_b holds the same solid at the same precision; the encoding makes no difference to the geometry.
Why will my IGES not become a solid?
Because many IGES files are surfaces that were never joined into a body, sometimes with gaps. If the conversion stops or the result is open, ask the sender for STEP or Parasolid, which carry a closed solid.
Will the converter tell me if the IGES was already faulty?
Yes. The upload is checked, and invalid faces or open shells that were already in it are reported with the result.
Is the IGES to Parasolid 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.
Will the Parasolid file keep exact curves and holes?
True surfaces are rebuilt, so the Parasolid result behaves like modelled geometry. Planes stay planes and cylinders stay cylinders: a hole comes through as one face with a radius you can measure and mate to. Unsupported geometry is refused with a message naming it, never silently degraded.
Will the Parasolid file open in Fusion 360, Inventor or Onshape?
Yes. Parasolid 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.
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 IGES 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 IGES 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
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Going the other way? Convert Parasolid to IGES.

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