Thread: PDF goes from 38 MB to 2.5 GB when converted to Epub?
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Old Yesterday, 11:28 PM   #2
kovidgoyal
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Presumably this is a scan pdf i.e. all the pages are images. It will be because in EPUB the images are stored in a less space efficient format (EPUB and PDF dont support the same set of image formats). Open the EPUB in the edit book tool and see for yourself.
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