Manuscript Formatting for KDP: Trim Size, Margins and Bleed

Most KDP formatting problems start weeks before upload, when a manuscript is still an A4 Word file with no thought given to binding. By the time the previewer flags text outside the margins, page count, cover spine and contents have all been built on the wrong size. Fix the physical setup first.

This guide covers the interior only — the pages inside your paperback. The cover is a separate file, sized only after this one is final. If you are publishing Indian nonfiction — a founder story, a professional guide, a memoir — the choices below decide whether your book looks like a printed book or a printed document.

Start with trim size, because everything else follows it

Trim size is the finished size in the reader's hand, after cutting. Your document page size must match the trim size selected in KDP — or trim plus bleed, if you use bleed. Change it after layout and you will reflow every chapter, change your page count, and invalidate a cover calculated from the old count.

For most Indian nonfiction, 6 x 9 inches is the practical default: a comfortable line length, room for tables and callouts, and a size that sits naturally beside business and self-development titles. The smaller 5.5 x 8.5 inches suits shorter, more personal books — memoir, poetry, a compact guide — and runs to more pages for the same word count. Avoid going large just to look substantial: 8.5 x 11 inches makes a text-heavy narrative feel sparse and pushes up print cost for no reading benefit.

Margins and the gutter: the part readers feel in the spine

Every page has four margins: top, bottom, outside (away from the binding) and inside, next to the spine. That inside margin — the gutter — is where most first books go wrong. A bound book does not open flat; pages curve into the binding, and thicker books lose more of the inside edge. KDP therefore sets a minimum inside margin that grows with page count.

KDP's minimums, from its paperback manuscript guidance, are summarised here. Treat them as floors, not targets. For a comfortable page, most professionally set books use a little more than the minimum, especially at the top and bottom once headers and page numbers are added.

• 24 to 150 pages: inside (gutter) margin at least 0.375 in (9.6 mm)
• 151 to 300 pages: inside margin at least 0.5 in (12.7 mm)
• 301 to 500 pages: inside margin at least 0.625 in (15.9 mm)
• 501 to 700 pages: inside margin at least 0.75 in (19.1 mm)
• 701 to 828 pages: inside margin at least 0.875 in (22.3 mm)
• Outside margins: at least 0.25 in (6.4 mm) without bleed, at least 0.375 in (9.6 mm) with bleed — top and bottom follow the same minimums

In Word, use mirrored margins so the inside and outside swap correctly on left and right pages, and put the gutter value in the Inside field. KDP's own Word guidance is explicit on this point: do not also enter a value in the separate Gutter field, or you will double-count the space. And if your page count changes during editing — it usually does — check again whether you have crossed into the next band. A book that grows from 148 to 162 pages needs the wider inside margin.

A quick sense check before you export

View your draft as a two-page spread, not scrolling single pages. If the inner edge feels tight on screen, it will feel worse in print. Add space rather than defending the minimum — white space is what makes a long chapter readable.

Bleed: only when something must reach the edge

Bleed means an image, background colour or design element runs right to the edge of the trimmed page, with no white border. If nothing in your book needs to touch the edge, you do not need bleed — and most text-only nonfiction does not. Headings, body text and ordinary inset images that sit inside the margins are not bleed content.

If even one page needs bleed — a full-page photograph, a coloured chapter opener that fills the page, a diagram that runs off the edge — the whole interior must be set up with bleed and uploaded as a PDF. KDP asks you to extend bleed content 0.125 in (3.2 mm) past the trim line on the top, bottom and outside edges. There is no bleed on the binding edge. In page-size terms, you add 0.125 in to the width and 0.25 in to the height: a 6 x 9 in book becomes 6.125 x 9.25 in. Do not add crop or trim marks; KDP handles trimming in production, and its file guidance says submitted files should not contain printer's marks.

Rule of thumb: if you have to ask whether a text-only book needs bleed, it almost certainly does not. Reserve bleed for pages where the design genuinely reaches the edge.

Fonts, size and line spacing that survive a long read

Print typography is fixed — the reader cannot enlarge it. Choose a readable, properly licensed serif for body text in most nonfiction, such as Garamond or Georgia, whose letterforms stay clear at small sizes. A clean sans serif can work for headings and captions, but a full book in a display font will tire the reader.

For a 6 x 9 in page, body text around 10.5 to 12 point with line spacing around 1.3 to 1.5 times is a sensible working range. Smaller than that and older readers will struggle; much larger and your page count — and print cost — climbs without adding value. Whatever you choose, use paragraph and heading styles consistently instead of formatting each section by hand. Styles are what keep chapter headings identical, generate a reliable table of contents, and let you change one decision everywhere at once.

Two points matter at export. Embed all fonts — KDP recommends full embedding rather than subsets, and an unembedded font can be substituted, wrecking your layout. Images should be at least 300 DPI at printed size, with transparency flattened.

Page numbers, running headers and chapter openings

Page numbers usually sit at the bottom centre or at the outside edge — bottom-left on left pages, bottom-right on right pages. Running headers, if used, commonly carry the book title on left pages and the chapter title on right pages. A printed nonfiction book without page numbers will frustrate anyone using your contents page.

Front matter is traditionally numbered with Roman numerals, with Arabic numbering from Chapter 1. Many independent authors simply leave front matter unnumbered, which is fine if done cleanly. What matters is sequential numbering and uncluttered chapter openers. Check this in the exported PDF, spread by spread — not just in Word.

Front matter and back matter: a working checklist

Front matter is everything before Chapter 1. A typical nonfiction sequence is: title page with title, subtitle and author name exactly as entered in KDP; copyright page with your notice, edition note and ISBN if you have one; an optional dedication; a table of contents with accurate page references; and, as needed, a preface or introduction. Keep the copyright page factual.

Back matter comes after the final chapter. Consider: acknowledgements, an about-the-author page, endnotes or a bibliography if you cited sources, and an appendix for material that would interrupt the chapters. Do not pad it with blank pages — KDP's review checks for excessive consecutive blank pages, and readers notice padding.

Word, dedicated tools, and the ebook difference

Word can produce a compliant KDP paperback if you set page size, mirrored margins and styles carefully and export a clean PDF — KDP publishes step-by-step Word guidance for this. Dedicated tools such as Adobe InDesign or Affinity Publisher give finer control over spreads and typography, and suit illustrated or workbook titles. Automated formatters are faster for a straightforward text book, less flexible with tables or footnotes. The tool matters less than the discipline: lock trim first, finalise the text, then format once.

Your ebook is a different file, not a resized print PDF. Kindle text is reflowable: readers choose font and size, so there are no fixed margins, running headers or printed page numbers. Remove print-only furniture, rely on heading styles for navigation, and build the contents from those styles, not typed page numbers. Keep print and ebook sources separate once you split them.

Pre-upload checklist for the interior

• Trim size in the document matches the trim size selected in KDP, including bleed dimensions if bleed is used
• Inside (gutter) margin matches your final page count band, and outside, top and bottom margins meet KDP minimums
• Page size with bleed, if applicable, is trim width plus 0.125 in and trim height plus 0.25 in
• Body font is readable at final size, styles are used consistently, and all fonts are embedded in the export
• All interior images are at least 300 DPI at printed size, embedded, with transparency flattened
• No crop marks, trim marks, comments, annotations or placeholder text remain in the file
• Front matter order is conventional, title and author name match KDP metadata exactly, and the contents page was updated last
• Page numbers are sequential, headers do not appear awkwardly on chapter openers, and there are no stray blank pages
• File is a single-page-per-sheet PDF (not spreads), not locked or encrypted, and under KDP's 650 MB limit
• You have read the exported PDF as spreads and checked it in KDP's Print Previewer before ordering a proof copy

Formatting rewards patience. Spend the extra hour on margins, styles and a proof read of the PDF, and you will save a review cycle — and a cover re-do. If you would rather have this handled alongside editing and publishing, Authorly helps founders and professionals in India prepare print-ready books for Amazon KDP — start at https://book.authorly.shop/start and bring your draft as it is.