Most converters fail on Z-height. Ensure your DWG has 3D solids (extruded polylines) or meshes, not just 2D plans. If your DWG is 2D, the converter will produce a flat PLN with zero volume.
New SaaS tools are emerging that use machine learning to look at a DWG floor plan and automatically generate a wall network in PLN format. These convert not just lines, but architectural logic (recognizing wall joins and room boundaries). dwg to pln converter
Pros: No software install, free for small files. Cons: You are uploading proprietary building plans to a random server (Privacy Risk). Usually, they output a "dumb" 3D model (Triangulated mesh), not a smart PLN with walls and windows. Tools like BIMDeX or Okino PolyTrans are enterprise-grade DWG to PLN converters. Most converters fail on Z-height