A geometry kernel
Parasolid is the engine that builds and edits precise solid geometry inside many CAD tools.
Format Guide中文
What is Parasolid?
Parasolid is a widely licensed geometric modeling kernel developed by Siemens, powering CAD systems such as NX, SolidWorks and Solid Edge. Its exchange files use the .x_t (text) and .x_b (binary) extensions.
Published Jun 10, 2026Updated Jun 10, 2026
X_T and X_B
X_T is the text transmit format; X_B is the binary variant — both carry the same solids.
Where it powers CAD
NX, SolidWorks, Solid Edge and many others are built on Parasolid.
Why exchange Parasolid
Because many systems share the Parasolid kernel, exchanging X_T / X_B can give very clean, lossless solid transfers between them.
When the target system is not Parasolid-based, STEP is the more universal neutral choice.
Convert online
Convert Parasolid to STEP for universal distribution, or STEP to Parasolid to feed a Parasolid-kernel system.
You can also inspect Parasolid solids in the online viewer before converting.