Given the lack of a verified converter, here are the legitimate alternatives:

Several tools or scripts claim to convert PS3 PKG to PS4 PKG. Upon inspection, most perform one of two tasks:

In the world of console modding and game backups, the idea of converting PlayStation 3 (PS3) PKG files to run directly on PlayStation 4 (PS4) has long been a topic of interest. Recently, searches for a “PS3 to PS4 PKG converter verified” have increased. But what does this mean, and does such a tool actually exist?

If you own a PS4 on firmware 9.00 or lower: