Converting PDF Book to AZW3 - Massive file size!

-Palamedes- · 10-11-2024, 08:50 AM

I'm trying to convert the Ashley Book of Knots to some sort of eBook file.

The book is freely available online as a pdf, eg here:

https://archive.org/details/TheAshleyBookOfKnots

It's a large pdf file - 42mb.

I've tried to convert this to AZW3 using Calibre, and it's produced a file that is 147mb and won't load in Calibre's viewer (which I think may be due to the large file size).

The book is illustrated throughout with simple monochrome line drawings.

Can anyone help me or suggest what I should look at to try and resolve this?

Thanks a lot.

Foozle · 10-11-2024, 08:55 PM

Don't convert it. As has been noted before multiple times and in the Calibre manual, PDF is the worst format to convert from.

Because archive.org is currently down, the file can't be accessed to view it. However, from what you're describing, it sounds like a heavily image-based document. If so, that's your problem. All it does it take the pages and convert them to images in the ebook.

If you want an actual, proper ebook, you would have to find one already formatted as such, or do a bunch of extra work to get it the way you want.

Otherwise, your best bet is to just keep it as PDF.

10-11-2024, 08:50 AM	#1
-Palamedes- Junior Member Posts: 1 Karma: 10 Join Date: Oct 2024 Device: Kindle Paperwhite	Converting PDF Book to AZW3 - Massive file size! I'm trying to convert the Ashley Book of Knots to some sort of eBook file. The book is freely available online as a pdf, eg here: https://archive.org/details/TheAshleyBookOfKnots It's a large pdf file - 42mb. I've tried to convert this to AZW3 using Calibre, and it's produced a file that is 147mb and won't load in Calibre's viewer (which I think may be due to the large file size). The book is illustrated throughout with simple monochrome line drawings. Can anyone help me or suggest what I should look at to try and resolve this? Thanks a lot.

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10-11-2024, 08:55 PM	#2
Foozle Connoisseur Posts: 61 Karma: 221034 Join Date: May 2021 Device: None	Don't convert it. As has been noted before multiple times and in the Calibre manual, PDF is the worst format to convert from. Because archive.org is currently down, the file can't be accessed to view it. However, from what you're describing, it sounds like a heavily image-based document. If so, that's your problem. All it does it take the pages and convert them to images in the ebook. If you want an actual, proper ebook, you would have to find one already formatted as such, or do a bunch of extra work to get it the way you want. Otherwise, your best bet is to just keep it as PDF.

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