Quote:
Originally Posted by retiredbiker
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.
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All that is good advice. I do it as well. Also, remove the unused CSS classes. There can be hundreds of unused classes that take up space. I use a compression level of 70 as for most graphics, it makes no noticeable difference.
If you compress Kindle eBooks more then the default, you end up using more battery as it takes more processor to uncompress.
@johnelle, do you have to have so many eBooks on the Kindle?