To format a book for KDP, you need a print-ready PDF with embedded fonts, margins that match Amazon’s specifications for your trim size and page count, and an even total page count. An 80,000-word novel typically produces around 280 pages at 5.5” x 8.5”, costing roughly $4.21 to print through KDP. This guide covers every step — trim size selection, margin math, typography, front and back matter, and the export settings that determine whether KDP accepts or rejects your file.
What KDP actually needs from you
When you upload a print interior to KDP, you’re submitting a PDF. Amazon’s automated review — which typically takes 24-72 hours — checks that PDF against a specific set of requirements:
- Page size matches your selected trim size (e.g., 5.5” × 8.5”)
- Margins meet minimum requirements for the page count (more pages = wider inside margin for the binding)
- Fonts are embedded in the PDF (not linked, not system fonts)
- Images are at least 300 DPI if you have any
- No content bleeds into the margin or gutter area
- Page count is even (KDP requires an even total page count)
If any of these fail, you get the dreaded: “Your interior file does not meet our requirements.” No specifics. No line number. Just rejection and the cycle of fix, re-upload, re-wait. Formatting tools like Cambric enforce these requirements at export time — margins, font embedding, even page count, and correct trim size are all validated before you upload.
Step 1: Choose your trim size
Your trim size is the physical size of your printed book. This is the first decision because it affects everything — margins, font size, line spacing, and page count.
The most common trim sizes for fiction:
| Trim Size | Best For | Notes |
|---|---|---|
| 5” × 8” | Mass market feel, romance, thriller | Compact, familiar to genre readers |
| 5.25” × 8” | Slightly roomier 5×8 | Good middle ground |
| 5.5” × 8.5” | The most popular indie choice | Works for almost every genre |
| 6” × 9” | Literary fiction, non-fiction, longer books | Feels more substantial, fewer pages |
If you’re unsure, go with 5.5” x 8.5”. It’s the standard for a reason — readable, professional, and cost-effective for printing. At this trim size, a typical 75,000-word novel runs about 270-310 pages, keeping printing costs around $4.09-$4.57 on the US marketplace. You can use our KDP Book Calculator to see how your word count translates to page count, spine width, and printing cost for any trim size.
For non-fiction, larger formats (6” × 9” or even 7” × 10”) are common, especially if you have figures, tables, or wide margins for notes.
Step 2: Set your margins correctly
This is where most rejected PDFs come from. KDP’s minimum margins depend on your page count:
Outside margins (top, bottom, outside edge): 0.25” minimum for all books.
Inside margin (gutter): This is the margin on the spine side of each page. It needs to be wider because part of the page disappears into the binding.
| Page Count | Minimum Inside Margin |
|---|---|
| 24–150 | 0.375” |
| 151–300 | 0.5” |
| 301–500 | 0.625” |
| 501–700 | 0.75” |
| 701–828 | 0.875” |
Don’t use the minimums. They’re minimums, not recommendations. Professional books use larger margins for comfortable reading. For a deeper look at how margins and gutter width affect readability and binding, see our complete guide to book margins and gutter. A good starting point for a 5.5” × 8.5” novel:
- Inside: 0.75”–0.85”
- Outside: 0.5”–0.65”
- Top: 0.6”–0.75”
- Bottom: 0.7”–0.85”
The bottom margin should be slightly larger than the top — this is a centuries-old typesetting convention that gives the text block a sense of being “held” on the page rather than sinking.
Step 3: Choose your fonts
For body text, use a professional serif font at 10–12pt with generous line spacing (leading). Common choices:
- Garamond — The classic. Elegant, highly readable, works for every genre.
- Caslon — Slightly more character than Garamond. Traditional and warm.
- Palatino — Wider letterforms, good for shorter books where you want more page presence.
- Source Serif — A modern serif with excellent readability at small sizes.
Not sure which to pick? Our Book Font Preview tool shows how each font looks on a realistic book page so you can compare before committing.
Avoid: Times New Roman (it was designed for newspapers, not books), Calibri (a screen font), anything sans-serif for body text. Studies on print readability consistently show serif typefaces improve reading speed and comfort for long-form text, and readers associate serif fonts with professionally published books.
For chapter headings, you have more freedom. A contrasting sans-serif (like Source Sans or Alegreya Sans) works well, or use your body font at a larger size with different weight or letter-spacing.
The critical rule: All fonts must be embedded in your PDF. If KDP can’t find a font, it substitutes — and your carefully chosen typography becomes a mess. To verify embedding, open your PDF in Adobe Acrobat and check File > Properties > Fonts; every font should show “(Embedded)” or “(Embedded Subset).” Most formatting tools handle embedding automatically. If you’re using InDesign or Word, check your export settings.
Step 4: Structure your front and back matter
A professional book interior isn’t just chapters. The pages before and after your story matter:
Front matter (in order)
- Half title page — Just the book title, no author name. Sets the stage.
- Title page — Full title, author name, optionally publisher/imprint.
- Copyright page — Copyright notice, ISBN, edition info, “This is a work of fiction” disclaimer.
- Dedication (optional)
- Epigraph (optional) — A quote that sets the tone.
- Table of contents (optional for fiction, expected for non-fiction)
Back matter (in order)
- Acknowledgments (optional)
- About the Author — Keep it short. Include a photo if you have a good one.
- Also By — List your other books. This is critical for series authors — it’s free advertising. For authors with a backlist of 5+ titles, an Also By page can measurably improve series sell-through.
- Preview of next book (optional) — First chapter of the next book in your series. Powerful for sell-through.
Front matter pages are traditionally numbered with lowercase Roman numerals (i, ii, iii) or not numbered at all. Arabic page numbers (1, 2, 3) start with the first chapter. For a complete breakdown of front and back matter elements and their standard order, see our guide to front matter and back matter. For the specific rules governing page numbering conventions, see book page numbering rules.
Step 5: Handle scene breaks and chapter openings
Scene breaks
A blank line between paragraphs is not a scene break — it’s ambiguous and can disappear at a page break. Use a visible marker:
- Three asterisks centered: ⁂ or * * *
- A small ornament — a fleuron, a simple rule, or a decorative glyph
- A blank line with a centered rule — a thin horizontal line
Whatever you choose, be consistent throughout the book. Our guide to scene break formatting and the dinkus covers the full range of options and when to use each one.
Chapter openings
This is where amateur formatting reveals itself most. Professional chapter openings typically include:
- Chapter number in small caps or a contrasting style
- Chapter title (if applicable) in a larger, distinctive font
- A drop cap on the first letter of the first paragraph — the large decorative initial letter that signals “this chapter begins here”
- Small caps on the first few words after the drop cap (a common convention)
- Additional white space above the chapter heading (the “sink” — typically 1/3 to 1/2 of the page)
The chapter opening is the single biggest differentiator between “self-published looking” and “professionally typeset.” If you do nothing else, get your chapter openings right. For detailed design ideas and examples, see our guides on chapter heading design and drop caps in book formatting.
Step 6: Export your PDF correctly
When you export your interior PDF, these settings matter:
- PDF version: PDF/A or PDF 1.4+ (KDP accepts both)
- Color space: Black and white interior -> Grayscale. Color interior -> CMYK or sRGB. Note that color printing costs roughly 4x more per page than black-and-white on KDP.
- Font embedding: All fonts embedded (no subsetting issues)
- Bleed: 0.125” on all three outer edges if your content extends to the page edge (most novels don’t need bleed — see our book bleed settings guide for details)
- Crop marks: Off. KDP doesn’t want crop marks.
- Page size: Must match your selected trim size exactly — a mismatch between your PDF dimensions and your KDP trim selection is the second most common cause of rejection.
The IngramSpark difference
If you also publish through IngramSpark, their PDF requirements are slightly stricter:
- They prefer PDF/X-1a:2001 format
- They require CMYK color space for color interiors
- Bleed requirements may differ by trim size
If your formatting tool can produce a PDF that passes IngramSpark’s file creation guide, it will also pass KDP. The reverse isn’t always true.
The easy way
Everything above — margins, fonts, front matter, scene breaks, chapter openings, PDF settings — is what you’re managing when you format a book manually in Word or InDesign. It’s doable, but it takes hours per book and requires knowing all these specifications by heart.
Cambric handles all of this automatically. Pick one of 20 professional templates, set your trim size, and the software calculates margins, sets typography, generates your front matter, and exports a KDP-ready PDF with embedded fonts. You see real typeset pages as you work — not an approximation, the actual output your reader will hold. One-time purchase, $109, runs on your machine with no internet required.
If you want to compare options, Vellum ($250, Mac-only) and Atticus ($147, cloud-based) are the other major tools. Our comparison page breaks down the trade-offs honestly.
Common reasons KDP rejects your PDF
If you’ve already uploaded and been rejected, check these first (for a deeper dive into each rejection cause, see our guide to common formatting mistakes in self-publishing):
- Inside margin too narrow for your page count. This is the #1 cause. Recalculate using the table above.
- Fonts not embedded. Open your PDF in Adobe Acrobat, go to File → Properties → Fonts, and verify all fonts show “(Embedded)” or “(Embedded Subset).”
- Page size doesn’t match trim size. Your PDF pages must be exactly your trim size (e.g., 5.5” × 8.5”), not letter size (8.5” × 11”).
- Odd page count. KDP requires an even total page count. Add a blank page at the end if needed.
- Content in the margin area. Headers, footers, or body text that extends into the minimum margin zone.
- Low-resolution images. Any image below 300 DPI will be flagged.
The bottom line
Formatting a book for KDP isn’t conceptually difficult — it’s just detailed. The specifications exist because physical printing has physical constraints. Margins need to be wide enough for binding (0.375” minimum inside margin for books under 150 pages, scaling up to 0.875” for 700+ page books). Fonts need to be embedded because the printer doesn’t have your fonts installed. Pages need to be even because you can’t print half a sheet. Print still accounts for roughly 65% of fiction unit sales in the US, so getting these details right matters.
You can manage all of this manually, or you can use a tool like Cambric that handles the specifications automatically — margins, fonts, front matter, chapter openings, and KDP-compliant PDF export — so you can focus on making your book look beautiful. Either way, your readers will notice the difference between a book that was formatted with care and one that wasn’t. For a complete step-by-step publishing workflow that goes beyond formatting, see our self-publishing checklist.