Kindles do not support the EPUB file format used by many other e-book readers. mobi e-book file format and produces the Mobipocket Reader software for mobile phones, personal digital assistants (PDA) and desktop operating systems. Mobipocket SA is a French company incorporated in March 2000 that created the. 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.
