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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.History
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.[2]
Features
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.[3][4]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.[5][6]
E-books can be imported into the Calibre library, either by sideloading files manually or by wirelessly syncing an e-book reading device with the cloud storage service in which the Calibre library is backed up or with the computer on which Calibre resides. Additionally, online content-sources can be harvested and converted to e-books. This conversion is facilitated by so-called "recipes", short programs written in a Python-based domain-specific language. E-books can then be exported to all supported reading devices via USB, Calibre's integrated mail server, or wirelessly. Mailing e-books enables, for example, sending personal documents to the Amazon Kindle family of e-book readers and tablets.[7][8][9][10]
The content of the Calibre library can be remotely accessed. This can be accomplished via a web browser, if the host computer is running and the device and host computer share the same network; in this case, pushing harvested content from content sources is supported on a regular interval ("subscription").[citation needed] Additionally, if the Calibre library on the host computer is stored in a cloud service, such as Box.net, Google Drive, or Dropbox, then either the cloud service or a third-party app, such as Calibre Cloud or CalibreBox, can be used to remotely access the library.[11][12][13][14][15]
Since version 1.15, released in December 2013, Calibre also contains an application for creating and editing e-books directly, similar to the more full-featured Sigil application, but without that application's WYSIWYG editing mode.
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