You actually do not need to convert .zi files to .zip, in majority of cases it's the same file type. Should you need it, you can simply rename zi to zip and extract the contents with any of the associated programs that support ZIP format.
Convert Renamed ZIP file to WinZIP Compressed ZIP archive.
We have found 4 software records in our database eligible for .zi to .zip file format conversion.
Microsoft Windows software - convert zi to zip on Windows
Another popular file archiver and compressor
Convert from zi file format
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 zi to zip. 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.
One of the oldest and most popular shareware file archiver and data compression utility
Popular open source file archiver with a high compression ratio
Apple macOS / Mac OS X software - convert zi to zip on OS X
Mac version of the popular WinZip compression utility.