Zip vs 7zip

I want to distribute all these files together to users in as small a format as possible. I looked into two different ways of doing it, each using two different compression schemes, zip and 7zip which I understand is either LZMA or a variant thereof :. For example, say that I have 3 zip files, A.

With method 1, a single compressed file would be created containing A. With method 2, a single compressed file would be created containing A. My assumption was that under either compression scheme, the file generated by method 2 would be smaller or at least the same size as the file generated by method 1, as you might be able to exploit efficiencies by considering all the files together.

At the very least, method 2 would avoid the overhead of multiple zip files. What was surprising was that for the zip format, compressing all zip files together resulted in a smaller output file than compressing all their uncompressed contents result 3 vs result 1.

Why is it more efficient to zip several zip files together, than to zip their unzipped contents together? The only thing I can think of is that during compression, the 7zip format builds a dictionary across all the file contents, so it can exploit similarities between files, while the zip format builds the dictionary per-file. Is that true? And even that still doesn't explain why result 3 was 7mb larger than result 1.

For instance, when you choose. Based on test, to compress 1. But if you choose the advanced compression format. How to compress a folder in Windows 10 to reduce the size of the folder? Check the 6 ways in this article to compress folders and files on Windows What operating system and browser does ezyZip support? Ensure you are using the latest version of one of the popular browsers or their variants. Chrome, Firefox, Safari, Opera. Please let us know via the feedback form if you have any issues.

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