Convert Parasolid
to IGES.

Updated 2026-10-06

To convert Parasolid to IGES, drop the .x_t or .x_b file into the converter below and download the .igs. The surfaces are translated exactly, with nothing turned into facets, and no account is needed for up to 2 solid conversions a day. Before you do, check whether the person asking would take STEP: it carries the same exact geometry and closes into a solid more reliably.

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

No account needed
Drop a Parasolid file.x_t / .x_b · 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.

ResultExact

Parasolid and IGES both store B-rep geometry, so planes, cylinders, cones and NURBS survive and dimensions, radii and tangency are preserved exactly.

ChangesParasolid → IGES

What changes between Parasolid and IGES

Both formats store exact geometry, so the shape survives: planes, cylinders, cones and NURBS faces arrive as the same surfaces, and no dimension moves.

What changes is the age and the habits of the format. IGES predates STEP by more than a decade and was built to exchange surfaces, not solids. Many systems read an IGES as a set of trimmed surfaces and leave it to the user to stitch them back into a closed body, which is where IGES earns its reputation for arriving with gaps. A Parasolid solid is closed when it goes in; whether the receiving software treats it as a solid when it comes out depends on that software.

Nothing beyond geometry travels: no feature history (the transmit file had none), and no colours or attributes. Choose IGES when a CAM programmer, toolmaker or older system asks for it by name; otherwise send STEP.

HowThree steps
  1. Drop your .x_t 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

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.

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.

Questions12 answered
How do I convert x_t to IGES?
Drop the .x_t or .x_b on this page, where IGES is already selected, and download the .igs.
Is .igs the same as .iges?
Yes. They are two spellings of the same format, and every program that reads one reads the other.
Why did the IGES open as surfaces instead of a solid?
That is how many programs read IGES: as separate surfaces to be knitted or sewn into a body. Use the receiving software's knit or sew command, or send STEP, which arrives as a solid.
What if the Parasolid file will not convert?
A few surface types, variable-radius blends among them, are not rebuilt yet. When the converter meets one it stops and names it rather than writing a damaged file, and the attempt does not count against your free conversions. Ask the sender for a STEP export instead; every Parasolid-based system writes one.
Is the Parasolid 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.
Will the IGES file keep exact curves and holes?
An exact translation: nothing is tessellated in either direction. Parasolid and IGES both store B-rep geometry, so planes, cylinders, cones and NURBS survive and dimensions, radii and tangency are preserved exactly.
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.
Does it read both .x_t and .x_b?
Yes. Text (.x_t) and binary (.x_b) hold the same solid, and both convert here.
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 Parasolid 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 Parasolid 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 IGES to Parasolid.

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