Sometimes you might want to convert ebooks from one format to the other.
Either because your ebook works better with a format or you want to print them to a certain size with margins.. etc. For example Nook has epub support for searching words in dictionary, while PDF doesn’t work well.. sometimes I might convert a book to get the extra features.
You can install Calibre which supports a variety of formats and options:
DejaVu .djvu
Comic Book Archives .cbr, .cbz, .cb7, .cbt, .cba
Mobi .mobi
Amazon Kindle .azw
And others including Epub, pdf.. etc
sudo apt-get install calibre
For example to have an even margin and make it pretty with a A4 size, use the following command. You can wrap a for loop around it and make it convert all your ebooks!
ebook-convert YourBook.epub "YourOutputBook.pdf" --pdf-page-numbers --paper-size a4 --pretty-print --margin-left 72 --margin-right 72 --margin-top 72 --margin-bottom 72