Book Design

KDP Cover Formatting Guide — Interactive Cover Template Calculator

TL;DR

A KDP cover template needs total width = (2 x trim width) + spine width + 6 mm bleed, with the spine calculated as pages x 0.002252 inches (cream paper). A 6x9 paperback at 300 pages produces a 327 x 235 mm cover. Export PDF/X-1a in CMYK with Coated FOGRA39 profile for UK print. KDP can generate an EAN-13 barcode if you don't supply one. Run a KDP Readiness Score on publishing.co.uk to confirm your file is upload-ready.

Last reviewed by The publishing.co.uk Team — May 2026


Enter your book details below to get exact cover dimensions. The visual diagram updates in real time to show you exactly how your cover should be set up.

UK note: UK-specific considerations apply — ISBN purchases go through Nielsen (not Bowker), VAT rules differ from the US (print books are zero-rated; ebooks carry 20% VAT), and GDPR applies to any email/customer data. See our UK self-publishing guides for specifics.

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.

Visual Cover Diagram

Cover Layout (not to scale — proportions accurate)

BLEED AREA
Bleed (0.125")
Trim area
Safe zone
Spine
Barcode area

Cover Setup Specifications

After calculating your dimensions, set up your design file with these settings:

SettingValue
File formatPDF (single page)
Colour spaceRGB (KDP converts to CMYK)
Resolution300 DPI minimum
Bleed0.125" (3.175 mm) on all edges
Safe zone0.125" (3.175 mm) inside trim on all edges
Spine safe zone0.0625" (1.6 mm) on each side of spine
Barcode area2" x 1.2" white rectangle, bottom-right of back cover
Max file size650 MB

Common Cover Mistakes to Avoid

  1. Text too close to spine — Keep text at least 0.0625" from spine edges
  2. Background not extending to bleed — Colours and images must fill the bleed area
  3. Wrong spine width — Recalculate if you change page count or paper type
  4. Low resolution images — Use 300 DPI minimum; 150 DPI will look blurry in print
  5. CMYK colour space — KDP actually requires RGB; they convert to CMYK themselves
  6. Forgetting barcode space — Leave room for KDP's auto-generated barcode

Need a professional cover designed?

[Our formatting service](/order/) includes cover template setup with exact dimensions — from £69.

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You might also need

Further reading from official sources

Quick verdict

Use this if:

  • You're publishing your first 1-3 books and want a fast workflow
  • You don't want to learn complex software
  • Cross-platform compatibility matters

Skip it if:

  • You're publishing 10+ books and need granular control
  • Your books have complex layouts (cookbooks, picture books)
  • You already have a workflow that works

Best alternative: depends on your priority — speed (paid tool), price (free Calibre), or polish (paid service).

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.

About this guide

Written by The publishing.co.uk Team for publishing.co.uk. Last reviewed May 2026. Specs and pricing change — verify current figures with the linked sources before relying on them.

External references

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publishing.co.uk team

The publishing.co.uk Team

Robert Prime is a best-selling self-published author, veteran eCommerce strategist, and the founder of publishing.co.uk.

publishing.co.uk team

About the Author

The publishing.co.uk Team

Robert Prime is the founder of publishing.co.uk and a co-owner of LoveReading.co.uk. A Forbes Business Council member with 25+ years in eCommerce, he writes about Amazon KDP strategy, scaling indie author businesses, and the commercial side of self-publishing.

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