title_body: Kindle doesn't show cover I just got a kindle as Christmas present. I got myself calibre and loaded 4 E-Books on my kindle. I can open and read every book, but unfortunately I just can see the covers of 2 of these 4 E-Books although I set them explicitly with calibre. Does anyone of you know the cause for this failure?
  
  Edit I figured out that I couldn't see any covers because they had pdf format. I converted them to mobi and then it worked. But is it still possible to see a cover for pdf books? Because when I convert my pdf's to mobi the formatting is completely messed up. Or do you have any suggestions for proper formatting tools?
upvoted_answer: The PDF file format does not support cover images.
  
  PDF was designed to show a faithful representation of printed pages.
  Reflowing text to other page sizes typically is not possible; you should use PDF on an ebook reader only when the page layout is important.