I have a 1.5gb music folder in my laptop that I want to compress and then send it to my phone. So I wanna know does the size of the file remain same as it was before after unzipping and do zipped folders open in android phones

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Android should be able to unpack zip archives, at least using additional apps, but that is not related to Ubuntu.

How tightly a file can be compressed depends mainly on its file type. Formats like mp3 are already strongly compressed by themselves, putting them in a zip will not gain much, if anything. Uncompressed formats like wav though can shrink significantly when compressing them.

Other than this rough separation in internally compressed/uncompressed file formats, you can't get an approximate number of how small your files really become other than by simply trying it out.

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