Parasolid kernel
X_T / X_B is the native exchange for Parasolid-based systems like NX and SolidWorks.

Convert STEP (.step / .stp) into Parasolid (.x_t / .x_b) to feed the Parasolid kernel used by NX, SolidWorks and Solid Edge. Done online in WO3D — no install required.
X_T / X_B is the native exchange for Parasolid-based systems like NX and SolidWorks.
Parasolid is a precise solid representation, ideal for editable engineering geometry.
No CAD software needed — upload STEP in the browser and get Parasolid out.
When a recipient on NX, SolidWorks or Solid Edge prefers Parasolid, converting STEP to X_T / X_B can give cleaner imports.
Parasolid often round-trips solids more reliably within Parasolid-kernel CAD systems.
X_T is the text Parasolid transmit format; X_B is the binary variant.
Both carry the same solid geometry — choose what your CAD prefers.
If you are unsure of the recipient kernel, STEP remains the broadest neutral choice.
Use Parasolid when you specifically target a Parasolid-based system.