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The EPUB format is the most widely supported e-book format, supported by most e-book readers except Amazon Kindle [a] devices. Most e-book readers also support the PDF and plain text formats. E-book software can be used to convert e-books from one format to another, as well as to create, edit and publish e-books.
EPUB is a popular format for electronic data interchange because it can be an open format and is based on HTML, as opposed to Amazon's proprietary format for Kindle readers. Popular EPUB producers of public domain and open licensed content include Project Gutenberg , Standard Ebooks , PubMed Central , SciELO and others.
Kindle File Format is a proprietary e-book file format created by Amazon.com that can be downloaded and read on devices like smartphones, tablets, computers, or e-readers that have Amazon's Kindle app. E-book files in the Kindle File Format originally had the filename extension.azw; [a] version 8 (KF8) introduced HTML5 & CSS3 features and had the .azw3 extension; and version 10 introduced a ...
Unlike most other formats, PDF documents are generally tied to a particular dimension and layout, rather than adjusting dynamically to the current page, window, or another size. Different e-reader devices followed different formats, most of them accepting books in only one or a few formats, thereby fragmenting the e-book market even more.
Google Play Books, formerly Google eBooks, is an ebook digital distribution service operated by Google, part of its Google Play product line. Users can purchase and download ebooks and audiobooks from Google Play, which offers over five million titles, with Google claiming it to be the "largest ebooks collection in the world".
Sumatra PDF is a free and open-source document viewer that supports many document formats including: Portable Document Format (PDF), Microsoft Compiled HTML Help (CHM), DjVu, EPUB, FictionBook (FB2), MOBI, PRC, Open XML Paper Specification (OpenXPS, OXPS, XPS), and Comic Book Archive file (CB7, CBR, CBT, CBZ). [3]
In April 2017, Amazon released Kindle Create, an application for converting Word and PDF files into Kindle-compatible files; before this release there were multiple Amazon apps to convert various types of files. [6] Total royalties paid out on Amazon KDP were over $260 million in 2018, [7] increasing to over $300 million in 2019. [8]
The application stores reading progress, bookmarks and annotations in a central directory using one JSON file per book. These can be synchronized with other devices, although it uses a format that does not work immediately with other reading software. It can also check for spelling errors in annotations and export them as Markdown. [8]