I have some problems in compressing anything,it not become smaller file size. I am using window 10,7 zip ,compression level-Ultra,etc..shown in web. But it compressed only little smaller size .eg I made 100Mb, it became 99Mb size. Please help me in knowledge.

  • What are you trying to compress? You can't compress movies or audio. – Tetsujin Jun 13 at 7:20
  • I tried on Movies and softwares – Khaine Jun 13 at 7:21
  • 3
    See superuser.com/questions/645151/… The first comment under the question gives the essence of why it's not going to work. – Tetsujin Jun 13 at 7:24

Data can't be compressed infinitely. In particular, data that is already compressed doesn't compress well. Otherwise we could compress, then compress again, then repeat and so on, getting smaller file each time. It's not possible due to information entropy. There's some amount of information in each file that has to be stored if you want to recover original file without any malformations. Compression is basically about storing this information in optimized way. Optimized stuff is already optimized, you can't optimize it again to get better results.

Movies, music and software installers are usually already compressed, so they don't compress well.

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