Thread: EPUB3 to EPUB2 Compression issues
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Old 02-15-2025, 06:11 PM   #3
JSWolf
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Quote:
Originally Posted by maddz View Post
I'm finding the compression changing epub3 to epub2 in v7.25 isn't working. I downloaded a 20 MB epub3 book from Kobo and ran it through the converter. No difference in file size - if anything, a little larger. I managed to get it to 16 MB by compressing the illustrations (b/w line art). Then I ran it using 3.48 on an older machine - it shrank to 3.42 MB with (as far as I can see) no loss in image quality.

Both versions are outputting to epub2. What's the difference?
The difference could be the settings. In 3.48, what is it set to in Preferences > Conversion > Common Options > Page Setup? I have Output profile set to Tablet and Input profile set to Default profile.

By setting Output profile to Tablet, it means that there will be no reducing hi-res images in size or compression. That's what you want set.
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