Quick Answer: To format a book for KDP, set your page size to a standard trim (6×9" is the most common), then set the inside (gutter) margin to KDP's minimum for your page count — 0.375" up to 150 pages, 0.5" for 151–300, 0.625" for 301–500, rising to 0.875" for 701–828 — with outside, top and bottom margins of at least 0.25". Use a readable serif body font at 11–12pt with all fonts embedded, keep images at 300 DPI, build a linked table of contents, then export a print-ready PDF/X-1a for paperback or a reflowable EPUB for Kindle. UK authors: print books are zero-rated for VAT, ebooks carry 20%, and your own ISBN comes from Nielsen (£93 single, £174 for ten).
Full step-by-step below.
Formatting a book for KDP (Kindle Direct Publishing) is the process of preparing your manuscript's interior layout to meet Amazon's technical specifications for print-on-demand paperback and Kindle eBook publishing. This includes setting the correct trim size (typically 6 x 9 inches for most genres), configuring margins and gutter widths based on page count, applying consistent paragraph styles and fonts, inserting page numbers and running headers, creating a linked table of contents, ensuring images are at least 300 DPI, and exporting the final file as a print-ready PDF (for paperback) or reflowable EPUB (for Kindle). In the UK, authors must also consider Nielsen ISBN requirements and VAT implications on pricing. The most common reasons KDP rejects manuscripts are incorrect margins, embedded font issues, and images that extend into the bleed area. This guide walks you through every step of the KDP formatting process, from initial page setup to final upload, with specific guidance for UK-based authors publishing through Amazon's UK marketplace.
Last reviewed by Robert Prime — June 2026
Formatting a book for Kindle Direct Publishing (KDP) is often the most technical and frustrating part of self-publishing, especially for UK authors who face specific market nuances that many US-centric guides overlook. Preparing a KDP-compliant file that looks professional both in print and as an ebook was a completely different beast. Despite a technical background, you can lose hours wrestling with margins, trim sizes and font embedding — the "Google, panic, repeat" cycle this guide is built to end.
KDP requires precise formatting to ensure your book appears exactly as intended on a myriad of devices and in print. This includes understanding concepts like trim size, bleed, margins, and the differences between EPUB files. Since KDP is a global platform, UK authors must also be mindful of ISBN registration through Nielsen, VAT considerations, and pricing strategies relevant to the UK market.
Before you start, ensure you have:
- A finalised manuscript in a clean, editable format (preferably Word DOCX or Google Docs).
- Clarity on your book's physical dimensions (KDP supports many trim sizes but 5"x8" and 6"x9" are popular).
- A UK-registered ISBN if you want to maintain control over your publishing imprint (free KDP ISBNs assign Amazon as publisher).
- Access to professional formatting tools or services if you don’t want to build the formatting yourself.
- A clear budget that includes not only formatting but also cover design-related tax implications.
- Awareness of market expectations in the UK, including print quality standards and retail pricing norms.
Author’s note: When I first self-published in the UK, I underestimated the importance of buying my own ISBN. Using a KDP-assigned ISBN left me with Amazon as the listed publisher — not ideal for long-term branding or distribution outside Amazon.
Experience insight: I consult for a billion-pound business that was struggling with the exact same formatting issues—it was literally stopping them from scaling their back catalogue. This shows even large publishers don’t have it all figured out.
1. Choose Your Trim Size and Page Setup
Your book’s trim size determines its physical dimensions and impacts layout decisions. Popular UK self-published sizes are 5"x8" (127mm x 203mm) or 6"x9" (152mm x 229mm). Setting the right trim size early saves headaches later.
In Microsoft Word:
- Go to Layout > Size > More Paper Sizes.
- Enter your desired width and height in millimetres or inches.
- Click OK.
For UK authors, I recommend using millimetres since the UK publishing industry standardises on metric measurements, plus it’s easier to communicate with designers and printers locally.
Set margins to accommodate the binding:
- Go to Layout > Margins > Custom Margins.
- Use at least 12.7mm (0.5") for outside margins and set the inside (gutter) margin to KDP's minimum for your page count — 9.5mm (0.375") up to 150 pages, 12.7mm (0.5") for 151–300, rising to 22mm (0.875") for 701–828 pages.
Pro tip: For books with many pages, increase the inside (gutter) margin so text doesn't disappear into the spine. A 250-page book needs 12.7mm (0.5"); a 450-page book needs 15.9mm (0.625").
2. Format Your Paragraph Styles
Fiction and non-fiction have different conventions:
- Fiction: Use first-line indents (about 7.5mm or 0.3") without extra spacing between paragraphs to keep the flow natural.
- Non-fiction: Often uses block paragraphs with spacing between paragraphs and no indent, making lists and sections clearer.
In Word:
- Highlight your paragraphs, right-click and select Paragraph.
- Under Indentation, set Special: First line to 7.5mm (0.3").
- Under Spacing, set After to 0 for fiction or 6-8pt for non-fiction.
Avoid manual spacing with Enter keys — use styles for consistency. Create and modify your own paragraph styles named “Body Text – Fiction” or “Body Text – Non-fiction” for easy reuse.
3. Choose Appropriate Fonts
KDP supports most standard fonts, but avoid decorative or overly stylised fonts like Papyrus, Bleeding Cowboys, or anything that hurts readability. Reliable choices include Garamond, Georgia, Times New Roman, or Arial for body text.
Font size should be between 10pt and 12pt, depending on your genre and target audience. For children’s books or older readers, 12pt or larger is advisable.
UK-specific note: UK readers often expect serif fonts for literary fiction and non-fiction, as they’re easier on the eye in print. On Kindle devices, sans-serif fonts like Arial or Verdana can work better for screen readability.
4. Insert Page Numbers and Headers/Footers
Page numbers are essential for print books but not for Kindle ebooks.
In Word:
- Go to Insert > Page Number.
- Choose bottom centre or bottom outside corners for print.
- Use Different Odd & Even Pages under Design > Options for professional layout.
Avoid page numbers on chapter opening pages — use Section Breaks:
- At the start of each chapter, insert a Next Page Section Break via Layout > Breaks > Section Breaks > Next Page.
- In the header/footer, unlink from previous section to remove page numbers on chapter starts.
5. Prepare Chapter Titles and Table of Contents (TOC)
Use Heading 1 styles for chapter titles. This allows Word to generate a clickable TOC.
For print books, insert the TOC after your front matter:
- Go to References > Table of Contents and choose an automatic style.
- Update the TOC after any edits by right-clicking and selecting Update Field.
For Kindle ebooks, KDP generates navigation based on your headings, but double-check with preview tools and on actual devices.
Pro tip: Use Heading 2 and Heading 3 sparingly for sub-sections to maintain clean navigation.
6. Handle Images and Graphics Carefully
Images must be high resolution (at least 300 dpi) for print. Insert images with Inline with Text wrapping to avoid layout issues.
For print books requiring bleed (images extending beyond the page edge), you need to increase page size slightly — for example, add 3mm bleed on all sides — and set the bleed margins in your PDF export. KDP requires a trimmed size plus bleed in the PDF.
UK tip: Use CMYK colour mode for print covers, as UK printers often expect this. KDP accepts RGB, but for local print runs or expanded distribution, CMYK ensures better colour matching.
7. Exporting Your File
For Kindle ebooks:
- Save or export your manuscript as .docx or .epub.
- KDP accepts Word DOCX natively and converts it to Kindle format.
- For better control, you can convert to EPUB using tools like Calibre or Vellum (Mac only).
For print:
- Export a PDF with embedded fonts and correct trim size/bleed.
- In Word, go to File > Save As > PDF, then select Options and tick ISO 19005-1 compliant (PDF/A) for compatibility.
- Ensure “Bitmap text when fonts may not be embedded” is unchecked to keep text crisp.
8. Validate and Preview Your Files
Use KDP’s Previewer tool to see how your book appears on various devices and in print. Look out for:
- Orphan or widow lines (single lines at top or bottom of pages).
- Incorrect page breaks or chapter breaks.
- Font or image glitches (missing fonts or low-res images).
Fix issues by adjusting your source file and re-uploading. For print, order a proof copy from KDP to check physical quality before finalising.
Experience insight: When I was formatting Google. Panic. Repeat., I spent hours on previewing and fixing tiny layout issues that no automated tool caught. This step is crucial and often overlooked.
ISBNs: The Nielsen Factor
In the UK, ISBNs are only available through Nielsen. Unlike Bowker in the US, Nielsen charges £93 for a single ISBN and £174 for a block of 10 (valid as of 2026). This is a significant upfront cost compared to US authors but necessary if you want to keep your imprint name on the metadata and retain full control over your book’s distribution and rights.
Many UK authors opt for free KDP-assigned ISBNs, which is tempting but comes with compromises:
- Amazon is listed as the publisher, not you.
- Your book’s metadata is controlled by Amazon, limiting your ability to list your book elsewhere or to shift distributors later.
- Some UK retailers and libraries may prefer or require a publisher-owned ISBN.
If you plan to sell in UK bookshops, libraries (via Ingram or Gardners), or want to register with Nielsen BookData for broader UK market visibility, you must purchase your own ISBN.
Author anecdote: I initially used a free KDP ISBN for my debut, but after wanting to distribute my book across UK independents and libraries, I had to buy Nielsen ISBNs and reformat metadata — a costly and time-consuming fix.
VAT and Pricing
Print books are zero-rated for VAT in the UK, meaning you don’t pay VAT on physical copies sold domestically. However, ebooks and digital sales carry a 20% VAT rate. This VAT difference impacts your royalty calculations and pricing strategy on KDP.
When setting your price for UK sales in KDP:
- Price print books in £ sterling (£) and factor in print costs (which KDP calculates based on page count, ink type, and trim size).
- For ebooks, set prices that reflect the 20% VAT. For example, if you want a net price of £3.99, the gross price should be about £4.79 to cover VAT.
- KDP’s royalty rates differ for ebooks priced between £1.99 and £7.99 (35% or 70% royalty tiers). Choose your price carefully.
Practical advice: Many UK authors price print books between £6.99 and £9.99 for trade paperbacks, balancing affordability with perceived value.
Cover Design and File Preparation
UK cover designers typically charge between £300 and £600 for professional, bespoke covers. While KDP provides a free cover creator, it lacks polish and flexibility, especially for UK market expectations where covers often follow specific genre conventions.
If you’re handling formatting yourself:
- Ensure your cover matches your trim size exactly, including spine width, which depends on page count and paper type.
- Add a 3mm bleed on all sides for print covers.
- Use colour profiles suitable for print (CMYK) or RGB depending on your printer’s requirements (KDP accepts RGB but UK printers may not).
- Export your cover as a PDF or JPEG at 300 dpi.
Spine width (mm) = page count × 0.0572 (for white paper) or × 0.0635 (for cream paper)
For example, a 200-page book on cream paper:
200 × 0.0635 = 12.7mm spine width
Add this to your front and back cover widths so the printed cover wraps the book exactly.
UK readers often expect certain standards in print quality and layout, influenced by longstanding British trade publishing conventions. For example:
- Paper choice (cream vs. white) influences font choice and size.
- Trade paperback sizes differ subtly from US sizes; 5"x8" is popular for fiction, but 6"x9" is preferred for non-fiction and larger books.
Author anecdote: I’ve seen UK authors priced out of bookshops by poor formatting and amateurish covers, despite strong content. Professional formatting is your first step to a professional sales channel.
The Freelancer Trap
Freelance typesetters on Fiverr or Upwork range from roughly £80 to £300 a book, with wide variation in quality and turnaround. Our automated, UK-tailored formatting service is a flat £69 with a 3-day turnaround and a 100% KDP-acceptance guarantee.
The real cost of formatting isn’t just money — it’s time and lost opportunities if your book isn’t properly prepared. For example, I spent 40+ hours on my first book’s formatting and lost weeks of sales waiting for fixes.
We see this come through our formatting queue at publishing.co.uk regularly, so the patterns and fixes here are based on what actually works at upload.
Frequently asked questions
Can I do this in Word or do I need specialist software?
Word can produce KDP-acceptable files but takes effort. Tools like Atticus, Vellum, or Reedsy Editor are faster for novels. For complex layouts (cookbooks, picture books) Adobe InDesign is the professional standard.
What's the minimum quality bar for KDP acceptance?
Embed all fonts, 300 DPI for any images, no bleed unless declared, trim size matched between cover and interior, single-page PDF for cover (not separate front/back). KDP accepts about 90% of files that meet these basics.
How long does the formatting process take?
DIY: 10-30 hours first time. Using a tool with templates: 2-6 hours. Paid service: 24-72 hours and no learning curve.
Should I order a proof copy before going live?
Yes — always. Proof copies are £4-£8 each and catch issues monitors don't show: paper bleed-through, spine alignment, cover gloss/matte feel.
Further reading from official sources
- KDP — Paperback manuscript formatting — Amazon's official formatting reference.
About this guide
Written by Robert Prime for publishing.co.uk. Last reviewed June 2026. Specs and pricing change — verify current figures with the linked sources before relying on them.
Related guides
- How To Upload Book To Kdp
- How To Self Publish A Book On Amazon Uk
- How To Format An Ebook For Kindle
- How To Outline A Novel
- Format Poetry Book Kdp
- KDP Rejected My Book? Common Reasons & Fixes
External references
- For current UK indie publishing trends, see the ALCS Author's Earnings report.
