The goal is for Amazon to accept your file on the first try. Here's what gets checked and what you get.
It validates the PDF it gives you against KDP's requirements: a valid trim size, a page count between 24 and 828, the minimum inside margin for your page count, the resolution of every image (300 ppi) and embedded fonts. You see the warnings before you publish, not after.
If KDP rejects the file because of the typesetting we generated, we'll reprocess it at no cost.
KDP only allows spine text on books with 79 pages or more. Gutter calculates the spine width from your page count and paper type, and warns you if there's text on a book that doesn't reach that minimum.
It creates an ePub from the same layout as the PDF: parts and chapters in separate files, a navigable table of contents, footnotes turned into endnotes with links back and forth, normalized images, and the correct cover and metadata. It's checked word by word against your manuscript and validated with EPUBCheck, the industry-standard tool.
It works on Kindle and all other stores: Apple Books, Kobo, Google Play, Nook and more. It's included in the price, at no extra cost.
Upload the interior PDF to Amazon KDP in your paperback edition's dashboard, and the ePub to your Kindle edition. After you pay, the “Your book is ready” email includes five tips for this step, with your PDF's actual trim size and page count.