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Old 12-24-2019, 01:38 PM   #1
Thargor
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Whats With All the 20mb Epubs All Of A Sudden?

Did something change in the last year or two? Every second epub I download especially on new releases seems to have jumped from 4-5MB to 20MB. These are pure text sci-fi/fantasy in the main, no illustrations or special fonts...

I know 20MB is nothing but when you have a huge collection like mine it adds up, is there any Calibre plug-in that strips out all this bloat and just leaves you with the cover/blurb/text/Chapters and a bit of formatting to keep it tidy or is that even possible?

Last edited by Thargor; 12-24-2019 at 01:53 PM.
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Old 12-24-2019, 01:47 PM   #2
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Originally Posted by Thargor View Post
Did something change in the last year or two? Every second epub I download especially on new releases seems to have jumped from 4-5MB to 20MB. These are pure text sci-fi/fantasy in the main, no illustrations or special fonts...

I know 20MB is nothing but when you have a huge collection like mine it adds up, is here any Calibre plug-in that strips out all this bloat and just leaves you with the cover/blurb/text/Chapters and a bit of formatting to keep it tidy or is hat even possible?
Edit Books is probably your best bet. Remove fonts and also look for jpeg picture files that are unrelated to the book (advertisements for other books in the series or by the author is common).
Good luck!
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Old 12-24-2019, 03:35 PM   #3
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With some books, the Chapter heading will be a .jpg instead of text.

I've also seen books where breaks within a chapter were done with a .jpg like this one:



And instead of using the same image over and over, the publisher inserted the image once for each instance it was used. So .jpg003, .jpg004 and .jpg005 would all be the same image. That sort of stuff really causes file size to increase.
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Old 12-24-2019, 05:41 PM   #4
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Quote:
Originally Posted by Thargor View Post
Did something change in the last year or two? Every second epub I download especially on new releases seems to have jumped from 4-5MB to 20MB. These are pure text sci-fi/fantasy in the main, no illustrations or special fonts...

I know 20MB is nothing but when you have a huge collection like mine it adds up, is there any Calibre plug-in that strips out all this bloat and just leaves you with the cover/blurb/text/Chapters and a bit of formatting to keep it tidy or is that even possible?
I just reconvert ebook files in Calibre. Most of the time the new copy of the same file usually an epub or mobi shrinks considerably.
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Old 12-24-2019, 05:48 PM   #5
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I just reconvert ebook files in Calibre. Most of the time the new copy of the same file usually an epub or mobi shrinks considerably.
Tried a few there, epub to epub in Calibre, not even a kb of difference afterwards.
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Old 12-24-2019, 06:22 PM   #6
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EPUBs are just zip files. Unzip them or list their contents and see which files take up the most space.
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Old 12-24-2019, 07:35 PM   #7
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Quote:
Originally Posted by ZodWallop View Post
With some books, the Chapter heading will be a .jpg instead of text.

I've also seen books where breaks within a chapter were done with a .jpg like this one:



And instead of using the same image over and over, the publisher inserted the image once for each instance it was used. So .jpg003, .jpg004 and .jpg005 would all be the same image. That sort of stuff really causes file size to increase.
Besides this, if any of the eBooks are from Penguin, there will be embedded fonts for one section that you do not need. You do not need that html file and you do not need those fonts. It's an advert for signing up to Penguin's email. The thing to do is use Calibre's eBook editor to see what it is in these eBooks that are making them so large.

@Thagor, can you please give us some of the titles/authors of these large eBooks? Thanks.

Last edited by JSWolf; 12-24-2019 at 07:39 PM.
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Old 12-24-2019, 08:28 PM   #8
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Besides this, if any of the eBooks are from Penguin, there will be embedded fonts for one section that you do not need. You do not need that html file and you do not need those fonts. It's an advert for signing up to Penguin's email.
Interesting.
Do they do it with Kindle books, too?
Amazon charges a small download fee based on file size.
Epub vendors don't.
It always seemed odd nickel and dimeing but maybe they figured publishers might try this kind of padding.
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Old 12-24-2019, 08:40 PM   #9
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Interesting.
Do they do it with Kindle books, too?
Amazon charges a small download fee based on file size.
Epub vendors don't.
It always seemed odd nickel and dimeing but maybe they figured publishers might try this kind of padding.
I cannot say 100%, but I would think so. I don't see any reason for Penguin to have this page in ePub only. I know it's rubbish, but that's Penguin for you.
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Old 12-25-2019, 12:52 AM   #10
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You could try using "losslessly compress jpegs" or whatever it is in the Calibre editor.
And if you're brave, you can lossily compress them while you're there
(And I've seen some insanely bloated books on the kindle store)

EDIT: It's "Compress images losslessly'

Last edited by binaryhermit; 12-25-2019 at 12:54 AM.
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Old 01-04-2020, 10:28 AM   #11
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Hi,

The Sigil forum is also packed with epubs editors... sure you can find help there too if you want to learn.

I you already are a Calibre user (I guess from your collection size), you can try the Calibre Editor forum to understand the way epub work and what the problem is with these 20mb jump...

Cheers
François
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