The EPUB format is the official eBook standard of the IDPF (International Digital Publishing Forum) and is designed for reflowable content, meaning an EPUB reader can optimize text for a display device, so that it is easier to read.
Most e-retailers will not sell PDF files in their online store, therefore, we do not accept them for ebooks.
Each of IngramSpark's major ebook retail partners has unique file requirements. A valid EPUB file for an eBook enables us to satisfy the requirements of each retail partner, getting your eBook where it belongs—on every device.
Click here to see the most current list of eBook retail partners.