Free online converter · no sign-up
X_T to IGES converter.
To convert a Parasolid .x_t file to IGES, drop it below and download the .igs file it makes, free and with no account. It is written as IGES 5.3 with trimmed surfaces in your browser, so the file never leaves your computer unless you choose to send it to us, and the IGES is read back and compared with what was read from your file before you can download it. Not every file converts: what cannot be rebuilt exactly is refused or left out, and the page says which.
Your file never leaves your computer unless you choose to send it to us: the conversion runs in your browser.
How to convert X_T to IGES
- Drop the file. Drop your .x_t file on the box above, or choose it from your computer.
- Check the format. Convert to is already set to IGES (.igs).
- Press Convert. The converter rebuilds the solid, writes its faces as IGES, then sews them back together to check them.
- Download the IGES. If a part of an assembly was left out, the page names it. If nothing could be converted, you get the reason.
| X_T to IGES | What happens |
|---|---|
| Reads | Parasolid text files (.x_t), parts and assemblies, from Parasolid 12 on. |
| Writes | IGES 5.3 (.igs) with trimmed surfaces, in millimetres. |
| Keeps | Every face keeps its shape, with a cylinder, cone or torus written as a surface of revolution. Every part of an assembly that can be rebuilt exactly, in place. |
| Drops | The joined-up solid, which the program opening the IGES has to rebuild, plus the assembly tree, part names and colours. |
| Checks | Volume, surface area, size and number of solids, after sewing the IGES back together. |
| Costs | Free, with no account and no limit on how many files you convert. |
Why go from Parasolid to IGES
Usually because the next program in line reads IGES and not Parasolid: an older CAM package, a machine controller's import, a customer's specification. If that program also reads STEP, send STEP instead, with X_T to STEP. An X_T holds a solid, a STEP holds a solid, and an IGES holds only the solid's faces, as trimmed surfaces, leaving the program that opens it to join them up.
What the IGES holds
- Trimmed surfaces, IGES 5.3, in millimetres. Nothing is turned into a mesh, though IGES describes a cylinder, cone or torus as a surface of revolution.
- Every part it can rebuild. A part of an assembly that cannot be rebuilt exactly is left out, the page says which, and the file's name counts what is there: frame (27 of 31 parts).igs.
- No assembly structure. An assembly's parts all land in one IGES file, each where the assembly places it, with no tree and no part names.
How the IGES is checked
Because IGES stores faces, the converter reads its own output back and sews the faces into a solid, closing gaps of up to 0.1 mm. The result has to match the solid it read from your X_T: volume to one part in a million plus a 10-nanometre layer over the surface, surface area to one part in 100,000, size to 0.001 mm, the same number of solids. That shows its own sewing closes the part. Another CAD system may sew at a tighter tolerance and leave faces apart.
A measured example
We tested this on a 120 x 80 x 30 mm bracket modelled in SOLIDWORKS 2024 (a plate with a filleted, chamfered boss and five holes). On a desktop PC its 13 KB X_T became a 101 KB .igs in 1.0 second. The check line read: "Verified: the IGES file was read back and holds the same solid. It agrees on volume to 0.0001%, surface area to 0.0001% and size to 0.001 mm, 1 solid in, 1 out." Measured on 5 November 2026. A file this simple is the easy case, not the typical one.
Parasolid files fail more often here than any other format. When an X_T will not convert says why, and what to do instead.
Credits and licences for the projects the converter is built on are on the converter page.
Questions
Should I send IGES or STEP?
Send STEP if the other side can read it. It keeps a solid as a solid, as the X_T did. Send IGES when their software or their specification asks for it.
Will the IGES open as a solid in my CAM software?
Not guaranteed. IGES stores faces, and joining them is left to the program opening the file. The converter proves only that its own sewing closes the part, at gaps of up to 0.1 mm. Some programs import every IGES as loose surfaces and need their own knit or sew command.
Is .igs the same as .iges?
Yes, two extensions for one format. The converter writes .igs. If your software wants .iges, rename the file.
Can it make an X_T from an IGES?
No. The converter reads Parasolid but does not write it. From an IGES it can make a STEP or an STL.
Every conversion
| From | To STEP | To IGES | To STL |
|---|---|---|---|
| SLDPRT | SLDPRT to STEP | SLDPRT to IGES | SLDPRT to STL |
| X_T | X_T to STEP | X_T to IGES | X_T to STL |
| X_B | X_B to STEP | X_B to IGES | X_B to STL |
| STEP (.stp) | Already STEP | STEP to IGES | STEP to STL |
| IGES (.igs) | IGES to STEP | Already IGES | IGES to STL |
| STL | STL to STEP | STL to IGES | Already STL |
Quoting laser-cut parts from files like these?
Lasertally is Windows software for fabrication shops. It opens STEP, IGES, DXF and NC1 files, measures the pierces, cut length and bends off the geometry, and prices the part on your own rate card.