What are WAD and PK3 files?
WadSmoosh: Specifically used to "smoosh" multiple official IWADs (Doom, Doom 2, etc.) into a single doom_complete.pk3 for modern source ports. Coverting a .WAD file to a .pk3 file? - Zandronum wad to pk3 converter verified
Verified WAD to PK3 converter:
While there is no single "one-click" verified application specifically named "WAD to PK3 Converter," the Doom modding community uses established tools and manual methods to achieve this. Because PK3 files are essentially renamed ZIP archives, you can convert them using standard file compression software or specialized Doom editors. Verified Conversion Methods Standard Compression (Manual Method): What are WAD and PK3 files