Quote:
Originally Posted by johnelle
As books get bigger and bigger I find myself going to the cloud more and more to compress books so they will squeeze on my wife's kindle. This is tedious because it involves exporting an epub, web compress, reload in calibre, reconvert, etc.
Last I checked this was not available in Calibre via plug-in or otherwise(?)
The web epub compress frequently cuts the size by an order of magnitude which I assume is mostly just adjusting image quality.
Any alternatives?
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If the book is epub or azw3, open it in the Calibre editor. Two tools to use.
Font manager: get rid of any embedded fonts; they can take up several megabytes if they are present. (Unless you can't live without that font...)
Under Tools-->Compress images losslessly. Check the box for lossy compression and put in a factor like 50. This can reduce jpgs up to 10-fold sometimes. If the images are png, very slow and not so much compression. You won't be able to see the difference on a Kindle.
Also look for advertising images and so on; you can just get rid of them.
Large png images you want to keep, export them and use another tool to convert to jpg, re-import (use replace image on right-click menu) and compress.
Run the bug check, correct errors, and save.
I recently had a book go from 19.1 megabytes down to 0.4.