Updated 2026-10-19
To convert SLDPRT to Parasolid, drop the .sldprt into the converter below and download an .x_t. Most parts come through on their own surfaces, so planes stay planes and holes stay cylinders, and the result tells you when yours did not. Nothing needs installing, SOLIDWORKS included. No account is needed for up to 2 solid conversions a day. With SOLIDWORKS to hand, Save As Parasolid (*.x_t) gives you the same kind of file.
2 solid-geometry conversions a day with no account. No card, no install, no CAD licence.
On our servers. No account: deleted within 24 hours. Signed in: kept until you delete them. Never shared or used for training.
A closed Parasolid 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.
A SLDPRT is a whole SOLIDWORKS document: the finished solid plus the feature tree that built it, sketches, configurations, material and custom properties. A Parasolid .x_t is only the finished solid, in the form SOLIDWORKS, Solid Edge, NX and other Parasolid-based systems exchange it.
So the shape carries over and the history does not. Usually the faces, edges and dimensions are the part's own, and a hole is still one cylindrical face with a radius you can measure or mate to. 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; the conversion says which of the three you got. The feature tree, sketches and configurations are left behind, as they are when SOLIDWORKS itself exports Parasolid. No converter can rebuild a feature tree from a solid, so treat any page that promises one with suspicion.
Parasolid is often the better hand-over between kernel-sharing systems: a Solid Edge or NX user gets the geometry in the form their software already uses. Anyone else is usually better served by STEP.
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.
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.
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.
Going the other way? Convert Parasolid to SLDPRT.
Need it in an older SolidWorks? Save a part for an older release.
SOLIDWORKS® is a registered trademark of Dassault Systèmes SolidWorks Corp. MeshWeave is an independent tool and is not affiliated with, endorsed by, or sponsored by Dassault Systèmes. Parasolid® is a registered trademark of Siemens. MeshWeave is an independent tool and is not affiliated with, endorsed by, or sponsored by Siemens.