KDP (Kindle Direct Publishing)

KDP lets any author put their book on sale on Amazon within hours: upload the file, write the product page (title, description, keywords, categories), set the price, and publish. Amazon pays a royalty (generally 35% or 70% of the price depending on the price range you choose and the region).

KDP enforces precise formatting constraints: margins, cover size, interior file dimensions depending on the format (digital or paperback). A file that doesn't follow these rules may be rejected during validation.

KDP is only one sales channel among others: nothing stops you from selling the same book on Gumroad, Payhip or your own store at the same time, as long as you haven't enrolled in KDP Select (exclusivity).