Amazon KDP Alternatives: Every Platform Indie Authors Should Know (With Cover Spec Notes)

Amazon dominates self-publishing — but it doesn’t own every reader. Apple Books users don’t browse Kindle. Kobo readers in Canada and Europe rarely cross over to Amazon. Libraries run on OverDrive and Bibliotheca, not KDP. If your book only lives on Amazon, you’re invisible to a significant slice of the reading world. This guide covers every platform worth knowing, plus the cover specifications each one requires — so your cover is ready before you upload, not after.

KDP Select’s exclusivity deal — 90 days of locking your ebook to Amazon in exchange for Kindle Unlimited enrollment — has been a useful tool for some authors. But it comes at a cost. Every day your book is exclusive to Amazon is a day it can’t be on Apple Books, Kobo, Barnes & Noble, or in library catalogs via OverDrive. For most genres, especially romance, fantasy, and cozy mysteries, wide distribution consistently outperforms exclusivity over time.

The platforms below fall into two categories: retailers (you upload directly and they sell to their customers) and aggregators (you upload once and they push your book to dozens of stores simultaneously). Most authors use a combination — direct uploads to the biggest retailers, aggregator for everything else.

One thing every platform has in common: your cover needs to meet their technical specifications before you can publish. Understanding the right book cover sizes for every format before you start is the fastest way to avoid rejected uploads and last-minute redesigns.

These platforms let you upload your book directly to their storefronts — no middleman, higher royalties, and full control over your listing. The tradeoff is managing each one separately.

Genre examples from our portfolio — the kinds of covers that perform across these platforms:

Romance — strong on Kobo & Apple Books

Fantasy — loyal wide audience beyond Amazon

Thriller — strong B&N Press & library reach

Aggregators are the most efficient way to go wide. One upload reaches dozens of retailers, library systems, and subscription platforms simultaneously. They take a small cut of royalties in exchange, but for most authors the reach far outweighs the fee.

IngramSpark is the gold standard for print distribution. As the self-publishing arm of the world’s largest book wholesaler, IngramSpark gets your paperback and hardcover into bookstores, libraries, and academic institutions that won’t stock KDP-exclusive titles. If you want your book orderable by a local bookstore or available for library patrons, IngramSpark is non-negotiable. The platform also accepts both paperback and hardcover formats with full control over wholesale discounts and returnability.

Draft2Digital (which merged with Smashwords in 2022) is the easiest aggregator for ebook-first authors. One upload reaches Apple Books, Kobo, Barnes & Noble, Tolino, OverDrive, Scribd, and more. Their auto-formatting tool converts a Word doc into a clean EPUB automatically. D2D also offers universal book links and automated end-matter updates across your whole catalog — a huge time-saver for series authors. PublishDrive is the choice for authors with large backlists who want territory-specific pricing, advanced analytics, and distribution to 400+ stores including regional retailers across Europe and Asia.

Covers that meet IngramSpark and D2D print quality standards — from our portfolio:

Sci-Fi — IngramSpark print-ready

Nonfiction — strong on D2D library systems

Every platform has its own cover file requirements. Uploading the wrong dimensions or resolution is one of the most common — and most avoidable — causes of rejected submissions. Here are the specs you need for each major platform:

Most successful wide authors use a stack of two to three platforms, not one. A common setup: KDP for Amazon (ebook + print), IngramSpark for bookstore and library print distribution, and Draft2Digital for all other ebook retailers. This covers the major bases without managing a dozen separate dashboards.

Your cover needs to be ready for all of them before you start uploading. That means your designer needs to know which platforms you’re targeting and deliver the right file formats: a high-resolution JPG for ebook platforms, a PDF/X-1a full-wrap for IngramSpark, and a standard print-ready PDF with bleed for KDP and B&N Press. Getting all of these from a single design session is standard practice — getting them wrong means resubmitting and losing launch momentum.

Platform choice also affects your cover dimensions if you’re publishing print. IngramSpark supports a wider range of trim sizes than KDP — including sizes KDP doesn’t offer at all, like 5″ × 8″ and some specialty formats. If your book’s ideal size isn’t available on KDP, IngramSpark is often the answer. Our ebook cover design service delivers platform-ready files for every major store — so you upload once and publish everywhere without the back-and-forth.