Calibre is a free, open-source e-book management application that serves as a complete solution for organizing, converting, and reading digital books. With over 50 million downloads, Calibre has become the most popular e-book manager, providing features that simplify building and maintaining personal digital libraries.
The library management interface organizes e-books with customizable metadata including title, author, series, tags, and ratings. The search function finds books quickly across large collections. Virtual libraries create focused subsets without duplicating files. Cover downloads automatically fetch book covers from online sources.
Format conversion handles over 40 e-book formats including EPUB, MOBI, AZW3, PDF, TXT, HTML, and many more. The conversion engine adjusts fonts, margins, and formatting for optimal reading on specific devices. Metadata can be embedded during conversion ensuring proper display on e-readers.
The built-in e-book viewer renders books beautifully with customizable fonts, colors, and reading modes. Bookmarks, highlights, and notes track reading progress. Text-to-speech reads books aloud.
Device synchronization transfers books to e-readers from Kindle, Kobo, Nook, and others with automatic format conversion as needed. The content server shares your library over your network or internet, enabling access from any device with a web browser.
News download fetches articles from hundreds of websites and newspapers, converting them to e-book format for offline reading. Custom recipes create feeds from any website. Duplicate book detection identifies copies in your library.