Calibre is an efficient and straightforward application that offers you to organize, convert, and view e-books in a simple manner. The user can add e-books by drag and drop function or use the file browser and also add books by entering their ISBN code. The user interface is simple to use this program. You can sort e-books in the tag browser according to their language, author, news, rating, publisher, format, and series, identifies, and tags. The user can download or edit metadata, convert e-books individually or in bulk (in the MOBI, EPUB, CSV, XML, and other formats), merge e-book records, get covers, and send e-books to devices. It is possible to use the Fetch news feature to download news, scheduled news downloads, and download all scheduled news sources or add a custom sources. This program allows you to backup, delete, rename, and restore libraries. Calibre is easy to use program that contains a comprehensive help file, uses a high amount of system resources, and no crash or error problems in this app.