The PS4 does not have a built-in PS3 emulator. Most "conversions" you see online are actually "remasters" or games that Sony specifically ported for the PS Plus Deluxe/Premium service.
When a tool is labeled “verified” in modding forums, it typically means: ps3 to ps4 pkg converter verified
PKG file for play on standard consoles. This is primarily due to the fundamental differences in hardware architecture between the two systems. The Technical Barrier The PS4 does not have a built-in PS3 emulator
If Sony could easily convert PS3 PKG to PS4 PKG, they would have done so for backward compatibility. Instead, they chose: ps3 to ps4 pkg converter verified
files for use on a modded PS3, but these still won't work on a PS4.