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What Fixed-Layout Formatting Actually Means

Fixed-layout EPUB3 (FXL) is a specification variant that preserves designer-controlled page composition. Every page is a fixed image-and-text composition with absolute positioning, declared viewport dimensions, and a separate XHTML document per page. The package metadata sets rendition:layout to pre-paginated, viewport metadata declares pixel dimensions (commonly 1200×1600 or 1600×2560 for HD), and images are positioned via CSS absolute coordinates rather than flowing with the text.

This matters when the visual relationship between text, illustration, and page edge is part of the reading experience. A picture-book spread where text wraps around a character, a comic panel sequence, a cookbook with photo-captioned recipes, or a magazine layout with sidebars and pull quotes — all of these collapse if reflowed. Fixed-layout keeps the page intact across devices, at the cost of larger files and reduced accessibility.

FXL vs Reflowable EPUB3

Reflowable EPUB3 adapts text to screen size, font preference, and orientation — the standard format for novels and most non-fiction. FXL freezes the page at a chosen viewport. Reflowable files run 1–5MB; FXL files typically run 5–50MB because every page carries embedded high-resolution imagery. Reflowable supports user font scaling and screen-reader linearisation; FXL does not, since pages are essentially composed images with a text overlay layer.

Reader-Engine Support

Apple Books has the most mature FXL renderer — spreads, page-flip animation, and read-aloud media overlays all work as specified. Kindle accepts FXL via KFX conversion (from a standard FXL EPUB3 import or built in Kindle Comic Creator) and renders picture books and comics acceptably on colour devices and the Kindle app. Kobo supports FXL on newer devices but falls back to reflowable on some older e-readers. Google Play Books and Nook have limited FXL support — layout fidelity varies, and complex compositions may not render as authored.

Why Authors Choose Fixed-Layout Formatting

• Visual integrity. Page composition stays exactly as designed across every supported device.
• Illustrated genres. Picture books, comics, graphic novels, cookbooks, and photo books require fixed layout to function.
• Spread support. Two-page spreads — standard in children’s books and graphic novels — only render correctly in FXL.
• Typography control. Custom fonts, drop caps, and decorative text positioning survive intact rather than being normalised by the reader.
• Apple Books distribution. The Apple Books store rewards well-built FXL with a mature renderer and category placement for illustrated titles.

For authors weighing FXL against reflowable for a hybrid title, our KDP editing services page covers the editorial decisions that precede formatting.

Frequently Asked Questions About Fixed-Layout Formatting

Can I convert a reflowable EPUB to fixed-layout?
Not directly. FXL requires per-page XHTML with absolute positioning, viewport metadata, and source artwork at the target resolution — it’s a rebuild from layout source files, not a conversion.

What viewport size should I use?
1200×1600 is a common baseline for picture books; 1600×2560 suits HD-targeted titles. The aspect ratio should match your designed page proportions to avoid letterboxing on device.

Will fixed-layout work on older Kindles?
FXL renders on colour Kindles, Fire tablets, and the Kindle app. Older monochrome e-ink Kindles have limited support — picture books appear, but greyscale rendering may not match the designed palette.

How large will the file be?
5–50MB is typical, depending on page count and image resolution. KDP delivery fees scale with file size on the 70% royalty tier, so image compression choices affect per-sale economics.

Does fixed-layout support accessibility features?
Limited. Screen readers struggle with absolutely-positioned text, and reflow-based assistive tools don’t apply. Media overlays (read-aloud) are the main accessibility path for FXL titles.