Last reviewed by Robert Prime — May 2026
Quick Answer: Your fixed-layout Kindle file (picture book, cookbook, fixed-page art book) is missing required metadata in the OPF file. Add
<meta property="rendition:layout">pre-paginated</meta>and<meta property="original-resolution">[width]×[height]</meta>to your OPF manifest, then re-package.
Full reasoning, why-it-happens, and the exact fix below.
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.
What this error means
Standard Kindle ebooks are reflowable — text re-flows to fit any screen size and font setting. That's wrong for picture books design-led books where each page is a fixed composition. Those need fixed-layout EPUB, where each page is a fixed-size frame that maintains its design at any screen size.
KDP requires fixed-layout EPUBs to declare three OPF metadata properties:
rendition:layout=pre-paginated(says "don't reflow")rendition:orientation=portrait/landscape/auto(says how to display)rendition:spread=landscape/both/none/auto(says whether to show two pages at once)
When these are missing, KDP either rejects the file or accepts it as reflowable — and the picture book's layout collapses to a single column of overlapping illustrations and text.
📎 Source: KDP's authoritative documentation on this rule is at KDP's fixed-layout Kindle requirements.
Why it happens
Calibre's EPUB output is reflowable by default. Authors converting a picture book PDF or InDesign export through Calibre get a reflowable result that doesn't fit picture books.
Hand-built EPUB in Sigil without explicit fixed-layout setup. Sigil supports fixed-layout but you have to add the OPF metadata manually.
Vellum doesn't support fixed-layout EPUB. It's designed for novel-style reflowable content. Picture book authors using Vellum need to switch tools.
Atticus added fixed-layout support but you have to explicitly enable it in project settings.
InDesign export with the wrong preset. "EPUB Reflowable" vs "EPUB Fixed Layout" are separate menu options — picking the wrong one is a common mistake.
Online EPUB converters (online2pdf etc.) almost never produce fixed-layout output.
The fix
Step 1: Confirm you need fixed-layout. Use fixed-layout for:
- Picture books with text overlaid on illustrations
- Comics and graphic novels
- Cookbooks with multi-element spread designs
- Children's early readers with synchronised text
- Photography books
Use reflowable for: novels, most non-fiction, poetry (mostly), short stories.
Step 2 (InDesign): File → Export → choose "EPUB (Fixed Layout)" not "EPUB (Reflowable)". The fixed-layout export panel asks for orientation handling. Set them appropriately.
Step 3 (Affinity Publisher): Affinity doesn't have native fixed-layout EPUB export. Workaround: export as PDF, then use Kindle Comic Creator (free Amazon tool) to convert PDF → KPF fixed-layout.
Step 4 (Kindle Comic Creator workflow): Download from Amazon → import your image files (or PDF pages) → choose Portrait, Landscape, or "Both with Pop-Up Panels" → Build → export as KPF (Amazon's fixed-layout format). KPF uploads directly to KDP.
Step 5 (Kindle Kids' Book Creator): For picture books with text, this free tool from Amazon is purpose-built. Import images, add text overlays, choose orientation, build KPF.
Step 6 (manual OPF edit in Sigil): Open your EPUB → content.opf → add to the <metadata> block:
<meta property="rendition:layout">pre-paginated</meta>
<meta property="rendition:orientation">portrait</meta>
<meta property="rendition:spread">none</meta>
Also add the property to each <spine> <itemref>:
<itemref idref="page01" properties="rendition:page-spread-left"/>
<itemref idref="page02" properties="rendition:page-spread-right"/>
Step 7: Set viewport on each XHTML page so Kindle renders at the right aspect ratio:
<meta name="viewport" content="width=1200, height=1800"/>
Step 8: Run EPUBCheck. Fixed-layout EPUBs have additional validation rules — fix any errors that come up.
Step 9: Upload to KDP. Use the Online Previewer to see fixed-layout rendering on different devices.
How to pre-flight it
Our free KDP Readiness Score reads your OPF metadata, detects whether you have fixed-layout flags, and warns when content type (picture book, comic) doesn't match the declared layout mode. Plus 30+ other KDP rules.
Related errors
FAQ
What's the difference between EPUB and KPF? KPF is Amazon's proprietary fixed-layout package built on top of EPUB. KDP accepts both fixed-layout EPUB and KPF. KPF is easier to produce for picture books because tools like Kindle Comic Creator do the work for you.
Can I sell a picture book as reflowable EPUB? You can upload it, but it will look terrible on Kindle. Picture books need fixed-layout to keep illustrations and text positioned together.
Do early reader chapter books need fixed layout? Generally no — they're text with occasional illustrations. Reflowable works. Use fixed-layout only when text must overlay images.
Will my fixed-layout file work on Kindle e-ink? Older e-ink Kindles render fixed-layout but with limitations. Modern Paperwhite and above handle it well. Comics and picture books are mostly read on Fire tablets and phones anyway.
Frequently asked questions
When should I use fixed-layout instead of reflowable?
Picture books, illustrated children's books, cookbooks with complex layouts, graphic novels, or anywhere visual layout is essential. Reflowable is for novels and most non-fiction.
How do I know whether my book needs fixed-layout EPUB or reflowable?
Fixed-layout (FXL) is for picture books, comics, cookbooks with image-driven layouts, and any book where the visual layout is part of the content. Reflowable is for prose. The wrong choice produces a Kindle file that looks broken on small screens.
Can publishing.co.uk convert my reflowable EPUB to fixed-layout?
Yes — but a clean fixed-layout build usually starts from the original design files (InDesign, Affinity Publisher), not from an existing reflowable EPUB. Converting reflowable-to-FXL is technically possible but produces a lower-quality result than starting fresh.
Does fixed-layout affect Kindle Unlimited eligibility or royalty?
Fixed-layout is eligible for Kindle Unlimited but earns lower per-page reads (fewer KENP per book because pages are visually denser). For picture books and cookbooks the trade-off is fine; for novelisation in FXL it's the wrong format.
Related KDP error fixes
If you got the rejection above, you may also want to check these related issues — they tend to cluster:
Full list: KDP formatting errors hub · KDP rejection fixes hub · KDP rejected my book
About this guide
This page is part of a series of UK-focused KDP rejection guides at publishing.co.uk, each documenting a specific reason KDP can reject a print or Kindle file and the exact fix. Written by Robert Prime — founder of publishing.co.uk, co-runs the LoveReading network, and has overseen 500+ KDP submissions through formatting work in this category (kindle).
If you'd rather have someone else handle this and the other 35 issues KDP checks for, our formatting service is from £69 with a 3-day turnaround and a 100% KDP-acceptance guarantee.
Run a free KDP Readiness Score on your file before you upload — catches this issue and 35 others, in 60 seconds.
External references
- Amazon KDP Help — official KDP documentation
- Author Earnings reports (ALCS) — UK author income surveys
