title_body: Scaling all pages in a PDF or DJVU file to the same size I have a couple of PDFs and DJVU documents that I want to read on an ereader (namely, Kobo Touch). However, the size of the pages differ, between cover and actual content, and even between two different content pages, and what my ereader does is use the size of the first page as the "template" for the viewport size for all my documents. It means that if the first page is smaller, it will display only a small part of the next (bigger) pages, corresponding to the size of the first page. If the first pages is larger, then the other smaller pages will be tiny on a corner of the screen.
  
  In other words, how can I scale all pages in a PDF/DJVU document to the same size (preferably the largest size among the pages in the document)?
  
  PS: The files are mainly scanned scientific papers, in DJVU format, though I have to convert them to PDF in order to read them in my ereader.
upvoted_answer: There is a program called jPdftweak which will let you scale pdf pages to whatever size you would want. You can set the parameters for the conversion to the larger page size and jPdftweak will scale all the pages in the file in accordance with the settings you have made. jPdftweak is a cross-platform, free Java program.