How to Format a Book for Apple Books: Requirements & Checklist (2026)

Apple Books is the quiet giant of the eBook world. While most self-publishers obsess over Kindle, millions of readers buy and read exclusively inside Apple’s ecosystem. Apple pays a flat 70% royalty on every sale with no delivery fee, but it is also the pickiest major retailer about file quality: your book must arrive as a validated EPUB with a high-resolution cover, working navigation, embedded fonts, and an ISBN for every paid title. This 2026 guide shows you exactly how to format a book for Apple Books — the publishing routes, the EPUB, cover, and ISBN rules, and the rejection traps to avoid. If you are still deciding which file type each retailer wants, our EPUB vs MOBI vs PDF breakdown explains the formats first; this guide makes your Apple edition bulletproof.

By the end, you will know how to publish through Apple Books for Authors or an aggregator like Draft2Digital, what a validated EPUB3 requires, Apple’s exact cover specs, when you need an ISBN, how font embedding works, why Apple rejects books, how the 70% royalty compares to Amazon’s, and the checklist to run before you upload.

Your Two Routes Into Apple Books: Direct vs Aggregator

Every book on Apple Books arrives through one of two doors. The first is Apple Books for Authors, Apple’s own publishing portal. You sign up with an Apple ID, complete tax and banking forms, upload your EPUB and cover, and set your price from Apple’s tier list. Going direct costs nothing and you keep the entire 70% royalty. The trade-off: you do all the work — formatting, your own ISBN, validation, and handling rejections yourself.

The second door is an aggregator — a distributor like Draft2Digital, IngramSpark, or PublishDrive that delivers your book to Apple Books plus dozens of other retailers from a single upload. Aggregators handle ISBN assignment (many offer free ISBNs), run basic file validation, and often convert your Word document into a clean EPUB, removing most of the technical burden. The cost is a share of royalties: Draft2Digital, for example, takes 15% of the royalties on sales it distributes. Our Draft2Digital formatting guide covers that route in detail.

Go direct if you can produce a validated EPUB and want maximum royalty — the portal also gives you Apple’s sales analytics and preorder tools. Use an aggregator for one upload to Apple, Kobo, Barnes & Noble, and libraries, or if EPUB validation sounds daunting. Note Apple pays out only after per-territory earning thresholds, so low-volume authors may get paid faster through an aggregator. The table below compares the routes.

Apple’s EPUB Requirements: Validated EPUB3

Apple Books accepts EPUB 2 and EPUB 3, but EPUB3 is the standard to build to in 2026. Unlike Amazon — which converts your Word document for you — Apple expects a finished, standards-compliant EPUB as the delivery asset, and submitted EPUBs must pass the latest version of EPUBCheck. An EPUB that throws errors will be rejected at upload or bounced in review: run EPUBCheck yourself and fix every error before Apple ever sees the file.

Most fiction and narrative nonfiction should be built as a reflowable EPUB, where text flows to fit any screen and font size. Keep your CSS simple and relative: use em-based sizes, avoid fixed pixel heights on text containers, and let the device handle pagination. Fixed-layout EPUB pins every word to exact coordinates — right for children’s picture books, cookbooks, and comics, but wrong for a novel, where readers who enlarge the font get a broken experience. Apple scrutinizes fixed-layout files more closely, so use it only when the genre demands it.

Apple checks the package essentials: complete OPF metadata (title, creator, language, identifier, modified date), a manifest listing every content file, a spine in correct reading order, and a working EPUB3 navigation document. Broken internal links, missing images, and placeholder content like “lorem ipsum” are classic failures. Build from clean styled sources, convert with a reliable tool, validate, then test on a real iPhone or iPad: jump through the TOC, enlarge the font to maximum, and switch to dark mode.

Cover Art Specs for Apple Books

The cover must be at least 1400 pixels wide, delivered as a JPEG or PNG in the RGB color space. Aim higher than the minimum: 1600 × 2400 pixels (the standard 1:1.5 book ratio) looks crisp on Retina displays and in Apple’s large storefront artwork. Design in RGB from the start — late CMYK conversions shift colors — and keep file size sensible with good JPEG compression.

Apple also judges what is on the cover. The title and author name in the artwork must match the metadata in Apple Books for Authors exactly — a subtitle on the cover that is missing from the metadata is one of the most common rejection triggers. Avoid tiny text that vanishes at thumbnail size, since most readers discover books as small grid images, and skip price badges, unsubstantiated “bestseller” claims, and retailer logos. Apple’s reviewers compare the cover against the EPUB’s embedded cover page, so a mismatch or a blurry file sends the whole submission back.

ISBN Rules: What Apple Requires

Here is where Apple differs sharply from Amazon: Apple requires an ISBN for every paid book sold on Apple Books, and for any title on preorder. Kindle eBooks get by with Amazon’s free ASIN, but Apple has no equivalent — without a valid 13-digit ISBN in your book’s metadata, the upload will not clear Apple’s checks. Sort out the ISBN before you build the EPUB, because the number lives inside the file’s metadata as well as in your Apple dashboard.

If you publish direct through Apple Books for Authors, you must supply your own ISBN: buy it from your country’s official agency — Bowker in the US ($125 for a single ISBN, $295 for a block of 10), Nielsen in the UK, or free through Library and Archives Canada. Never buy ISBNs from discount resellers; the reseller is registered as the publisher of record, not you. If you publish through an aggregator, it can assign one of its ISBNs free — then distribute to Apple through that same aggregator. One ISBN identifies exactly one format of one edition, so your Apple eBook needs its own number. Our complete ISBN guide for self-publishers covers the one-ISBN-per-format rule, imprints, and 2026 pricing in full.

Two details catch authors out. First, the ISBN in your EPUB’s OPF metadata, the ISBN on the copyright page, and the ISBN in Apple’s portal must all match — a mismatch is an automatic rejection. Second, preorders require the ISBN up front and the final EPUB well before release day, so lock the number early and never reassign it to a different edition later.

Font Embedding Rules on Apple Books

Fonts are the silent killer of Apple Books submissions. The Books app lets readers override your body font — and most do — so your chapter headings and decorative elements are where custom fonts actually show. Apple requires every non-system font to be embedded in the file, subset to the characters you use, and licensed for eBook embedding. A referenced-but-unembedded font gets silently replaced by a system font — wrecking your headings — and reviewers may reject the book for missing font files.

Three rules keep fonts safe. First, license every font for eBook embedding: many desktop licenses do not cover eBooks, and free fonts from random sites carry murky terms. Stick to clearly licensed sources such as Google Fonts or buy an explicit eBook license, and keep the receipt. Second, embed and subset: include the actual OTF or TTF files, subsetted, and never use a font flagged “no embedding.” Third, declare fallbacks: end every font stack with a generic serif or sans-serif. Test at maximum text size before upload — enlarged type exposes clipping and line-height problems reviewers will find.

What Apple Rejects (and How to Fix It)

Apple’s review team rejects books for quality problems Amazon would wave through. The most common failure is an invalid EPUB — EPUBCheck errors such as manifest files that do not exist, broken internal links, or malformed OPF metadata. Fix every error in your source files and rebuild. The second big category is navigation failures: a missing or incomplete table of contents, or chapter links that land in the wrong place.

Third comes metadata mismatches: the title, subtitle, or author name inside the EPUB or on the cover differs from your Apple Books for Authors dashboard — copy them from one master document instead of retyping. Fourth is placeholder or incomplete content: “lorem ipsum” filler, “insert image here” notes, or unfinished chapters; Apple sells finished books, not drafts. Fifth, cover problems — wrong dimensions, blurry art, or a cover that does not match the metadata — cause a surprising share of rejections. A final pass with a pre-publish formatting checklist catches nearly all of these. When a rejection does arrive, fix the root cause, re-validate, and resubmit — a clean second pass usually clears review within days.

Pricing and Royalty Tiers on Apple Books

Apple’s pricing model is refreshingly simple. You pick your price from Apple’s tier list — standard tiers run from $0.99 up to $199.99, converted into local currencies worldwide — and Apple pays you 70% of the list price on every sale, at every price point. No 35%-versus-70% split like Kindle’s, no per-megabyte delivery fee. A $4.99 book earns about $3.49 whether it is a novella or a 500-page epic — Apple is especially attractive for image-heavy books that Amazon’s delivery fees punish.

Per unit, Apple wins: Kindle pays 70% only between $2.99 and $9.99 (minus delivery fees) and 35% outside it, so $0.99 earns about $0.69 on Apple versus $0.35 on Kindle. The caveat is volume — Kindle sells more overall, so most authors price identically everywhere and treat Apple’s royalty as the reward for going wide. Apple also supports free books and preorders (which need an ISBN and full metadata up front). Price changes propagate within a day or two — check how your tier renders in local currencies, since an awkward converted price hurts conversion.

The Pre-Upload Formatting Checklist

Run this checklist on every book before it touches Apple’s upload portal — it takes under an hour and prevents the vast majority of rejections.

• EPUB passes the latest EPUBCheck with zero errors.
• Table of contents is complete and every chapter link lands correctly on a real device.
• Cover is at least 1400 pixels wide, RGB, and matches your metadata exactly.
• Valid 13-digit ISBN matches in the EPUB metadata, copyright page, and Apple’s portal.
• All fonts embedded, subset, licensed for eBook use, with serif/sans-serif fallbacks.
• No placeholder text, filler images, or unfinished chapters anywhere.
• Tested on iPhone or iPad at maximum font size and in dark mode.
• OPF metadata complete: title, creator, language, identifier, modified date.
• Images embedded (not externally linked) and displaying correctly.
• Price tier chosen deliberately; preorder ISBN and final-file timing confirmed.

Conclusion: Ship an EPUB Apple Can’t Refuse

Formatting a book for Apple Books comes down to discipline: build a validated EPUB3, design a cover of at least 1400 pixels in RGB, assign an ISBN to every paid edition, embed only properly licensed fonts, and match your metadata everywhere it appears. Go direct for the full 70% royalty, or use an aggregator and accept the smaller cut. Run the checklist, test on a real device, and review becomes a formality instead of a gamble.