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.

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