The process of converting ZIP files to RAR online takes longer overall since most free websites rely on the speed of their servers and the speed of the internet connection. Also, larger archives tend to hang or fail. A much better option is to use a ZIP to RAR Converter that is based on your desktop. An example is Softaken Archive Converter which is very fast, and safe and you can convert multiple files in the same batch. It also works as a multi-format archive converter (ZIP, RAR, 7Z, TAR, and so forth). You can try the free demo before you purchase as well.
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