Amazon refers to text-heavy fiction and nonfiction eBooks as "reflowable" because this type of content reflows when an eBook's text settings are changed. In general, a book can be converted as a reflowable eBook when the body text can be easily separated from the images without losing any context or important layout design. For this reason, comic eBooks should be created and uploaded using a fixed-layout format.

The reflowable format supports Enhanced Typesetting, as well as a number of features that allow readers to interact with and customize the way the text appears on their devices. These features include dictionary, X-Ray (when available), text-to-speech (when available), Word Wise (when available), Kindle Real Page Numbers (when available), and the ability to change text and formatting settings.

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Metadata Guidelines

eBooks are reflowable by default. Reflowable eBooks do not need to specify meta name="book-type" in the OPF file, but <dc:language> and <dc:title> are required. If the page propagation direction is not left-to-right, page propagation direction should be provided either in the metadata or the spine. (Example: <meta name="primary-writing-mode" content="horizontal-rl"/>)

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Layout Guidelines

Create the content using single column layout. Do not use the CSS position: property for alignments.

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Text Guidelines

• Heading Alignment and Justification
• Body Text Defaults
• Formatting Paragraphs
• Fixed Values
• Margin and Padding Formatting
• Drop Caps
• CSS for Page Breaks
• Embedded Fonts
• Customizing Font Selection
• Page Number Guidelines
• Enabling Real Page Numbers
• Footnote Guidelines

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Image Guidelines

• Supported Image Input Formats
• Image Size and Quality Standards
• Image Dimensions for Responsive Layouts
• Use Color Images
• Photographs Should Be Optimized for High-Resolution Devices
• Use GIF or PNG for Line-Art and Text
• Image and Font Size Requirements for Line-Art and Text
• HTML vs. Images
• Positioning Image Captions
• Controlling Image Aspect Ratio
• Supported SVG Tags and Elements

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Table Guidelines

• Large Tables
• Create Simple HTML Tables
• Split Tables as Needed
• Table Features with Enhanced Typesetting
• MathML Support