Calibre (software)
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Calibre main interface
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| Original author(s) | Kovid Goyal |
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| Initial release | 31 October 2006 |
| Stable release | 2.83 (15 April 2017) |
| Repository | github |
| Development status | Active |
| Written in | Python, C, C++ (Qt), CoffeeScript, JavaScript |
| Operating system | Linux, macOS, Windows |
| Platform | Cross-platform |
| Size | 81.3 MB − macOS 64.2 MB − Windows (32-bit) 69.7 MB − Windows (64-bit) 62.9 MB − Linux |
| Available in | 37 languages (fully or partially translated) |
| Type | E-book management utility (utility software) |
| License | GNU GPL v3 |
| Website | www |
Calibre (stylised calibre), a free and open-source e-book computer software application suite which runs on multiple platforms, allows users to manage e-book collections as well as to create, edit, and read e-books. It supports a variety of formats (including the common EPUB and Kindle MOBI formats), e-book syncing with a variety of e-book readers, and conversion (within DRM restrictions) from different e-book and non-e-book formats.
On 31 October 2006, when Sony introduced its PRS-500 e-book reader, Kovid Goyal started developing "libprs500", aiming primarily to enable the use of the PRS-500 formats on Linux. With support from the MobileRead forums, Goyal reverse-engineered the proprietary file format LRF.
In 2008 the program's name changed to "calibre", written in all lowercase.
Calibre supports many file formats and reading devices. 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. 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. Calibre does not natively support DRM removal but may permit DRM removal after the installation of plug-ins with that functionality.
Calibre allows users to sort and group e-books by metadata fields. Metadata can be pulled from many different sources, e.g., ISBNdb.com; online booksellers; and providers of free e-books and periodicals in the US and elsewhere, such as the Internet Archive, Munsey's, and Project Gutenberg; and social networking sites for readers, such as Goodreads and LibraryThing). It is possible to search the Calibre library by various fields, such as author, title, or keyword; though as of 2016, full-text search had not yet been implemented.
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