title_body: Bulk conversion of PDF books to DJVU/MOBI/EPUB
upvoted_answer: I'm not sure why you wouldn't want to stick with PDF but I recently just converted over 1T of EPUBS &amp; MOBIs to PDF as I use Adobe Acrobat X Pro on a daily basis both personally, academically and professionally. 
  
  AniceSoft worked beautifully keeping everything as they should be and as it allowed me to set the margin size output for the final PDF. It will convert your files to EPUBS or whatever files you want. It is also capable of 100 files per batch and converts quite rapidly, especially when compared to Calibre which I had initially tried and found I could single convert quicker using Online-Convert (which is my go-to single converter for both work and pleasure). I was able to complete all of the conversions before the trial ran out. 
  
  As for DJVU, I found Online-Convert to do the best work and I use a 2cm border when I convert anything to PDF.