Kindles do not support the EPUB file format used by many other e-book readers. A structured storage system to bundle these elements and any associated content into a single file, with data compression where appropriate. A font-embedding/replacement system to allow fonts to travel with the documents. The PDF combines three technologies: A subset of the PostScript page description programming language, for generating the layout and graphics.

AZW3 supports a subset of HTML5 and CSS3 features, while acting as a container for a backwards-compatible MOBI content document. In late 2011, the Kindle Fire introduced 'Kindle Format 8' (KF8), also known as AZW3 file format. Kindle devices are designed to use Amazon's own e-book formats: AZW. Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it. The Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems. Application/pdf, application/x-pdf, application/x-bzpdf, application/x-gzpdf

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