PDF: The best format for viewing on any device or printing.
EPUB: Great for e-readers and most ebook platforms.
Word (.docx): Allows easy editing and formatting adjustment.
Markup (.md): Great for transforming to other formats.
However, to get your book ready for distribution, you will have to convert it to a format specified by your Publisher. For POD titles, this usually involves using a MS word template and printing it to PDF. For ebook titles, you might be able to edit and upload the epub file we will provide to you.