KDP Formatting Requirements: Margins, Fonts, and File Types That Won't Get Rejected

Formatting is the most common reason a first KDP submission gets delayed — not because the requirements are complicated, but because they're scattered across Amazon's own documentation and easy to get slightly wrong. This is a single reference for the formatting decisions that actually matter, for both ebook and print editions.

If you haven't gone through the full submission process yet, start with Self-Publishing on Amazon KDP: The Complete Beginner's Checklist — this article is the deep dive on one step in that list.

File types KDP accepts

For the ebook interior, KDP's preferred format is EPUB. It also accepts DOCX, which it converts internally, but conversion can introduce spacing, image, and heading issues that don't show up until you check the previewer — EPUB gives you more direct control over the final rendered result, especially for anything with headings, lists, or images beyond plain paragraphs.

For print interiors, KDP requires a print-ready PDF with fonts embedded. This is a different file from your ebook interior — print needs bleed and margin settings that don't apply to a reflowable ebook, so don't try to reuse the same export for both.

For covers, KDP wants a separate file from the interior — typically PDF for print covers (which must include the spine and back cover, sized to your exact page count and trim size) and JPEG or TIFF for ebook covers.

Trim size (print only)

Trim size is the physical page dimensions of your printed book. Common choices:

• 5" × 8" — common for fiction and shorter nonfiction
• 5.5" × 8.5" — a frequent default for general nonfiction
• 6" × 9" — common for longer nonfiction, business books, and workbooks
• 8.5" × 11" — common for workbooks, journals, and heavily illustrated content

There's no single "correct" size — it's largely genre convention, and picking something wildly outside the norm for your category can look off on a shelf next to comparable titles. If you're unsure, 6" × 9" is the safest general-purpose default for nonfiction. Whatever you pick, your cover PDF's spine width must match your exact page count at that trim size — this is calculated from your interior file, so finalize your interior before generating the cover file.

Margins and bleed (print only)

Print margins need to account for the gutter — the inner margin near the spine, which needs to be wider than the outer margins so text doesn't get lost in the binding. As a rough baseline:

• Inner (gutter) margin: at least 0.375"–0.5", more for books with higher page counts (thicker books need more room near the spine)
• Outer, top, and bottom margins: at least 0.25"–0.5"

If any images or design elements are meant to run to the edge of the page, they need bleed — extending past the trim line so there's no white sliver if trimming is slightly off during printing. If you're not using full-bleed images, you can skip bleed setup entirely and simplify your file.

Fonts

For print, all fonts must be embedded in the PDF — if a font isn't embedded and the reviewing system doesn't have it installed, text can render incorrectly or drop out entirely. Stick to standard, well-licensed fonts (Amazon's own examples include Garamond, Georgia, Times New Roman, Caslon, and similar serif faces for body text) and confirm your export process embeds fonts by default — most PDF export tools do, but it's worth checking your specific file rather than assuming.

For ebooks, fonts work differently — most e-readers apply their own default font unless you specifically embed one, and even then, users can often override it. Don't over-invest in exact font matching for the ebook edition the way you might for print; focus instead on correct heading structure (see below), which controls how the reader's own font renders your hierarchy.

Front matter order

Front matter should appear in a specific, conventional order — reviewers and readers both expect this structure, and deviating from it without reason reads as unpolished:

1. Title page
2. Copyright page
3. Dedication (optional)
4. Table of contents
5. Preface or introduction (optional)
6. Main content (chapters)

Your table of contents should use real, clickable heading links for the ebook edition — not a manually typed list of chapter titles with no navigation behind them. This is one of the more common issues that passes casual review but frustrates readers immediately, since Kindle's own navigation depends on your heading structure being correct, not just visually styled to look like headings.

Headings and structure

Use actual heading styles (Heading 1 for chapter titles, Heading 2/3 for subsections) rather than manually bolding and enlarging text to look like a heading. This matters for two concrete reasons: it's what generates your clickable table of contents automatically, and it's what lets e-readers apply consistent, theme-appropriate styling (a reader in dark mode with a serif font override still gets correctly distinguished headings if your structure is real, not just visual).

Images

• Use high enough resolution that images don't look blurry on high-density e-reader and tablet screens — a good baseline is images sized for at least 300 DPI at their intended display size, especially for anything with fine detail or text.
• Keep individual image file sizes reasonable — extremely large uncompressed images bloat your file size, which can affect delivery costs on some KDP royalty plans (Amazon charges a delivery fee based on file size for the 70% royalty option).
• Don't rely on color to convey meaning in charts or diagrams if there's any chance your book gets read on an e-ink device — test how it looks in grayscale.

A pre-submission checklist

Before uploading, verify:

• Interior file is EPUB (ebook) or print-ready PDF with embedded fonts (print) — not just a DOCX you're hoping converts cleanly
• Trim size is decided and your cover file's spine width matches your final page count
• Front matter is in the correct order, with a real table of contents
• All chapter titles use real heading styles, not manually styled text
• Images are high enough resolution and reasonable in file size
• You've reviewed the entire manuscript in KDP's previewer — not just the first few pages

Skip the manual formatting work

Getting all of this right by hand in a word processor is genuinely tedious — it's the part of self-publishing most authors find least enjoyable. If you write your manuscript with Ebook Creator, the export step generates a KDP-ready package directly (correct trim size, embedded fonts, proper front matter order, real heading structure) so you're not manually fighting margin settings before you can submit. See how it works or check pricing.