Smashwords prefers .doc files, but does allow upload of .epub files - though that route is still in beta (and has restrictions). https://www.smashwords.com/abou

Smashwords prefers .doc files, but does allow upload of .epub files - though that route is still in beta (and has restrictions). https://www.smashwords.com/about/supportfaq#prep https://www.smashwords.com/about/supportfaq#prep Amazon's KDP allow uploads in .doc, .docx and .pdf formats - https://kdp.amazon.com/en_US/help/topic/G200735480 https://kdp.amazon.com/en_US/help/topic/G200735480 Google Play Books take .epub and .pdf files - https://support.google.com/books/partner/answer/3424254?hl=en&authuser=1&ref_topic=3238502 https://support.google.com/books/partner/answer/3424254?hl=e...