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A standard format for ebooks defined by the International Digital Publishing Forum (IDPF)

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I had a similar situation: a 134 MB .mobi that I wanted to shrink. Here's how I reduced the file size to 26 MB. The key to this approach is that an .epub is actually just a zipped web page with … image files in it. Converted the .mobi to .epub with Calibre. Renamed the .epub to .zip. Extracted the .zip. Note the images subfolder. Mine had more than 1000 files in it. Used Photoshop (although …
answered Oct 25 '16 by Matt Greene