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)
Cover Setup Specifications
After calculating your dimensions, set up your design file with these settings:
| Setting | Value |
|---|---|
| File format | PDF (single page) |
| Colour space | RGB (KDP converts to CMYK) |
| Resolution | 300 DPI minimum |
| Bleed | 0.125" (3.175 mm) on all edges |
| Safe zone | 0.125" (3.175 mm) inside trim on all edges |
| Spine safe zone | 0.0625" (1.6 mm) on each side of spine |
| Barcode area | 2" x 1.2" white rectangle, bottom-right of back cover |
| Max file size | 650 MB |
Common Cover Mistakes to Avoid
- Text too close to spine — Keep text at least 0.0625" from spine edges
- Background not extending to bleed — Colours and images must fill the bleed area
- Wrong spine width — Recalculate if you change page count or paper type
- Low resolution images — Use 300 DPI minimum; 150 DPI will look blurry in print
- CMYK colour space — KDP actually requires RGB; they convert to CMYK themselves
- 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.
Format my book →You might also need
- Spine Width Calculator
- White vs Cream Paper
- Canva Book Cover Tutorial
- KDP Trim Size Guide
- KDP Formatting Checklist
Further reading from official sources
- KDP — Paperback cover specifications — official trim, bleed and spine rules.
Related Tools
Related guides
- Hire a cover designer
- A/B test covers
- Children's book illustrators
- Cover in Canva
- Free cover-design tools
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
- For current UK indie publishing trends, see the ALCS Author's Earnings report.
