Some (certainly not all) PAK files used as game resource packages are just renamed ZIP files. So you can create your own "PAKs" when you rename a ZIP archive that contains relevant data.
Convert WinZIP Compressed ZIP archive to Game resource package file.
We found 2 software records in the database related to .zip to .pak file format conversion.
Microsoft Windows software - convert zip to pak on Windows
One of the many available file compression utilities
Convert from zip file format
|Yes, ALZip supports zip file conversion as a source file type.||Yes||Yes||zip editor||Yes||No||No||Yes|
|Yes, ALZip supports pak file conversion as a target file type.||No||No||No||No||No||No||Yes|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned zip to pak. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert zip to pak on OS X
Ma version of a free compression utility