Calibre provides the means to import ebooks that are stored on the computer system. It will display information like titles, authors, sizes, publishers and ratings in the default view mode. This can be changed to view the ebooks by cover or by tags instead.

Missing information can be edited manually or by pulling information from an Internet server that can retrieve information based on author, title or ISBN. The ebook management software is compatible with many file formats including the popular pdf, lit, mobi, cbz, cbr, txt and various others including zip and rar.

The ebooks can be launched and displayed in the default viewer of the selected file format from within the program’s interface. It is furthermore possible to convert single or multiple ebooks into different formats and sync them with electronic devices. Supported ebook readers include Amazon’s Kindle 1 and 2, Apple’s iPhone, SONY PRS 500/505/700 and Cybook Gen 3.

Another interesting feature is the ability to fetch RSS news feeds which are then made available in epub format by default with the option to convert it into a different format.

Calibe can run a (protected) server application that provides access to the ebook library from all computers with a web browser and Internet connection.