Quote:
Originally Posted by FelixKrull
Yes, it does seem to be the images, but I’m still trying to understand how this is even possible.
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It seems (like in "I don't really know but assume") or it is (like in "I really compared the files in depth")?
Did you choose "Edit Book" in calibre for the azw3 and epub file and/or open the epub file as archive in 7zip to look at the numbers and sizes of the html, style and picture files. Then you should be able to see what's causing the enlargement.
You could replace the picture files in the azw3 file in calibre with the picture files from the epub file (after extracting them). Since I only use calibre for very rare conversions into epub I only tested this with one picture I added to a azw3. Maybe there's a script to replace/import a large number of files into azw3. I don't know.