x3d to wrl conversion is almost certainly related to export of 3D models between X3D format and VRML format, typically in case when users want to turn modern content back to the previous format.
Not every data can be translated to the older format, but X3D format permits some backwards compatibility to VRML format. You can try Blender for this for example, but there are certainly more options.
Updated: October 2, 2023