Which digital book format should I use?
For viewing your digital book on a computer or for printing off pages, we recommend using the PDF format. For reading on an electronic device such as an iPhone, iPad, Sony Reader, Kobo, etc., we recommend using the ePUB format. Use the MOBI format for the Kindle. Most readers will support the ePUB version natively, but some require a little extra finesse to get your digital book loaded to your device. For more information, visit our page, How do I load my eBook to my Reading device?.