Calibre does not natively support DRM removal, but may allow DRM removal after installing plug-ins with such a function. Conversion and editing are easily applied to appropriately licensed digital books, but commercially purchased e-books may need to have digital rights management (DRM) restrictions removed. Most e-book formats can be edited, for example, by changing the font, font size, margins, and metadata, and by adding an auto-generated table of contents. Features Ĭalibre supports many file formats and reading devices. In 2008, the program, for which a graphical user interface was developed, was renamed 'calibre', displayed in all lowercase. With support from the MobileRead forums, Goyal reverse-engineered the proprietary Broad Band eBook ( BBeB) file format. On 31 October 2006, when Sony introduced its PRS-500 e-reader, Kovid Goyal started developing libprs500, aiming mainly to enable use of the PRS-500 formats on Linux.

Books in other formats like MOBI must first be converted to those formats, if they are to be edited.

Editing books is supported for EPUB and AZW3 formats. Calibre supports organizing existing e-books into virtual libraries, displaying, editing, creating and converting e-books, as well as syncing e-books with a variety of e-readers. Calibre ( / ˈ k æ l ɪ b ər/, stylised calibre) is a cross-platform free and open-source suite of e-book software.

Calibre companion free download