1 Reply Latest reply: Jan 30, 2013 10:48 AM by Jongware
dhananjay_dj Level 1 Level 1 (0 points)

Hello,

 

My application size is 35MB and .ipa file size 27MB.

How can I reduce ipa file size.

I have same project around 34 MB But its ipa file size only 8Mb.

I am not able to understand why this difference coming.

 

Please help.


iOS 6
  • 1. Re: Reduce ipa size
    Jongware Level 2 Level 2 (265 points)

    An .ipa file is actually a set of zip-compressed files. Some data compresses better than other; text, for example, may very well compress with a rate of 1 to 10, whereas binary data such as an executable (*), image (**) or sound (***) does far worse. See http://www.maximumcompression.com/index.html for a number of comparisons.

     

    If you want to significantly reduce the size, you'll have to find out where all those bytes are coming from. And then find a way to do without them.

     

    (*) Modern executables contain lots of zeros at several points (mainly padding data pages, IIRC). However, the bulk of a larger executable is probably code, and that compresses badly.

     

    (**) Computer images in general compress very well--so well, in fact, that you probably have *no* un-compressed images in your app. Both JPEG and PNG are natively already compressed, and therefore can hardly shrink any further.

     

    (***) .. except for MP3s. But (1) those aren't raw sound files, they are already compressed -- see the previous point. And (2) even if you do have raw sound data, the default compression algorithm will not *recognize* it as a sound file and then apply MP3 compression, it'll settle for the default ZIP-compatible compresssion.