FB2 – FictionBook

.FB2 (FictionBook) – is a single file format XML. The images in the book (format PNG and JPEG) are integrated directly in XML, using the coding algorithm Base64.

FictionBook typically compressed using ZIP-archive (in this case, a format .fb2.zip or .fbz).

Format introduction The main objective for storage of books in the FictionBook format is its accurate keeping of the book structure accompanied with the provision of effortless converting (including automatic) of FictionBook files to other popular formats: txt, doc, rtf, html and so on. Beside that, many reader applications allow to read the FictionBook format without converting.
Technical details The FictionBook format does not specify the appearance of a document; instead, it describes its structure. For example, there are special tags for epigraphs, verses and quotations. All ebook metadata, such as author name, title, and publisher, is also present in the ebook file. This makes the format convenient for automatic processing, indexing, and ebook collection management, and allows automatic conversion into other formats.
File extension .fb2 .fb2.zip .fbz
MIME text/xml
Developed by Dmitry Gribov
Type of format e-book file format
Associated programs HaaliReader, Calibre, FBReader, AlReader, Haali Reader, STDU Viewer, CoolReader, Fly Reader, Okular, Ectaco jetBooks, Documents for iOS, and some others
Wiki https://en.wikipedia.org/wiki/FictionBook