Calibre will do this for both mobi and epub, for unencrypted files.
Originally Posted by lockheed
I have a book for my Kindle in .mobi format. The problem is, the text is justified to the left, and right edge of the body of the text is jagged, uneven. This is very annoying while reading.
Is there some tool I could use to edit the mobi file and change the text so it is stretched to fill entire line width, like in every properly formatted book?
I also have it in ePub, so if mobi is not possible, I could do it that way.