eBook formatting guidelines for  Smashwords’ file processor are  specific and must be strictly obeyed  to get your eBook into their premium  catalog. The eBook conversion we  do for you will meet all of these  guidelines while keeping your eBook  looking how you designed it. When  you send your eBook to  Smashwords, their file processor  won't give you any errors and we've  never received a rejection from the  manual reviewers so you can have  the confidence that once your eBook  is reviewed, it'll be approved. 

Though ePUB is the format of choice  for most ereaders on the market,  eBook conversions to the ePUB  format are typically requested for use  with Barnes & Noble's PubIt system.  Publishing through Barnes & Noble’s  PubIt system has only one real  guideline: Look good. It makes sense  that if your eBook formatting doesn't  look good, the content is irrelevant  and if you don’t send up an ePUB file  there is no guarantee what your  eBook will look like after their system  processes it. We’ll send you back an  ePUB file so that when your eBook  goes live you’ll already know it looks  good. 

eBook conversions for publishing  through Amazon’s KDP system for  the Kindle are the most popular  request we get and this is where  you usually will make the most  sales. Publishing for the Kindle is  similar to what you go through at  Barnes & Noble, though instead of  ePUB files they use the MOBI  format. Also, like Barnes & Noble, if  you don’t send your eBook in the  final format (MOBI) there is no  guarantee on its final look. We’ll  send you back a MOBI file so that  when your eBook goes live you’ll  already know it looks good.