Home Switchboard Unix Administration Red Hat TCP/IP Networks Neoliberalism Toxic Managers
May the source be with you, but remember the KISS principle ;-)
Skepticism and critical thinking is not panacea, but can help to understand the world better


News Kindle  publishing bookshelf Recommended Links Self Publishing Grammar checkers Frontpage Kindle Publishing Tools
KindleGen Kindle Previewer calibre Guidelines  Amazon KDP Support Forum    
Electronic book libraries ePUB Format ePub readers and Tools Build a digital book with EPUB   Humor Etc

Adapted from calibre (software) - Wikipedia, the free encyclopedia

Calibre is an open source e-book computer software application suite licensed under GPL. It organizes, saves and manages e-books, supporting a variety of formats. It also supports e-book syncing with a variety of popular e-book readers and will, within DRM restrictions, convert e-books between differing formats.


Kovid Goyal started developing it  2006, when the Sony PRS-500 was introduced. The main idea was to enable the use of the PRS-500 on Linux. Goyal, with support from the MobileRead forums, reverse-engineered the proprietary file. In 2008, the name was changed to Calibre, generally written in lowercase even at the beginning of a sentence.


Calibre supports many file formats and reading devices. Most of these e-book formats can be edited, for example, by changing the font or the font size and by adding an auto-generated table of contents. Conversion and editing is only possible after digital rights management restrictions have been removed from commercially purchased e-book files. Calibre does not natively support this removal, but the capability can be added to the program by installing freely available plug-ins.

calibre helps to organize the personal e-book library by allowing the user to sort and group e-books by metadata fields. Metadata can be pulled from many different sources (, Google Books, Amazon, LibraryThing). Search for author, title or keyword in the whole library, is possible. Full-text search is not yet implemented.

E-books can be imported into the calibre library, either by adding files manually, or by syncing an e-book reading device. On-line 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 or via the integrated mail-server. Mailing e-books enables, for example, sending personal documents to the Amazon Kindle family of e-book readers.

The content of the library can be remotely accessed by a web browser, if the hosting computer is running. In this case, pushing harvested content from content sources is supported on a regular interval (subscription).

Development and license

The application is written in Python and C. It is published under the GNU General Public License v3 as free and open source software.[7]

To convert external content sources calibre supports the RSS-Feedreader protocol; for remote access an E-Mail- and Webserver (HTTP) is supplied.

Top Visited
Past week
Past month


Old News ;-)

[Dec 01, 2015] Calibre 2.45.0 Lets Users Generate Covers with Book Metadata, Fixes 10 Bugs

Calibre 2.45.0 introduces three new features. The first one is support for customising the text displayed under covers, which has been implemented under Preferences - Look & Feel - Cover browser. While the second feature lets users add their own columns or view detailed information about existing ones in Preferences, the third one allows you to generate covers with book metadata when sending books without covers to a device.

... ... ...

Last but not least, The Observer and The Guardian news sources have been improved. Download Calibre 2.45.0 for GNU/Linux, Mac OS X, and Microsoft Windows operating systems right now from Softpedia.

Complete Story

Related Stories:

[Aug 24, 2014] Calibre eBook Reader and Editor 2.0 Massive Update Arrives in Force

The Calibre eBook reader, editor, and library management software has been promoted to version 2.0 and it integrates a huge number of new features.

Calibre is a software that can be used for numerous tasks, like reading, converting, and managing eBooks and it's updated almost on a weekly basis. The developers bring changes and major improvements all the time, but it seems that a significant jump in the version number was also required.

The application has changed a lot since it was promoted to version 1.0 and that can be clearly seen in the interface. It's a stable application, with too many features to count. It's able to do pretty much anything that you can imagine, but the most interesting and the biggest feature has to be the ability to edit eBooks.

There are very few applications that can edit eBooks on a professional level, but Calibre is definitely up to the task. This particular feature has enough time to mature, and right now Calibre is probably the best software on Linux that can edit eBooks, and most likely on other platforms as well.

According to the changelog, Calibre now has an e-book editor capable of editing books in the EPUB and AZW3 (Kindle) formats, with many powerful tools and features specially designed for making editing e-books easier, users now have the ability to compare books, which allows them to see all the differences between two books, highlighted, side-by-side, and it's now possible to connect to any Android phone or tablet on OS X and the application should automatically detect and connect to it.

It's worth noting that Calibre has also switched to Qt 5, which means that the interface should look a lot more modern and it should integrate much better with the operating system. Also, a number of improvements have been added to the way the library is now organized, which should make the entire experience much more streamlined.

Installing the latest version of Calibre is quite easy, as the developer provides a simple script to do all that. It should be platform-independent, but some users might not be able to run it.

Users can also download the source package and try to compile it. It has many dependencies, so that might be an issue. The only other alternative is to get it from the repositories, but you might not get the latest release.

You can also check out our review of Calibre and download Calibre 2.0 from Softpedia, but keep in mind that this is just the source.

Recommended Links

Google matched content

Softpanorama Recommended

Top articles


calibre - E-book management -- main site

Frequently Asked Questions - calibre User Manual

Calibre - MobileRead Forums

Various tutorials on how to create/convert e-books with calibre.

Goyal, Kovid (2013-07-19). "calibre - What's new". Retrieved 2013-07-19.

Sorrel, Charlie. "How To Strip DRM from Kindle E-Books and Others". 01.17.11


The Last but not Least Technology is dominated by two types of people: those who understand what they do not manage and those who manage what they do not understand ~Archibald Putt. Ph.D

Copyright 1996-2018 by Dr. Nikolai Bezroukov. was initially created as a service to the (now defunct) UN Sustainable Development Networking Programme (SDNP) in the author free time and without any remuneration. This document is an industrial compilation designed and created exclusively for educational use and is distributed under the Softpanorama Content License. Original materials copyright belong to respective owners. Quotes are made for educational purposes only in compliance with the fair use doctrine.

FAIR USE NOTICE This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available to advance understanding of computer science, IT technology, economic, scientific, and social issues. We believe this constitutes a 'fair use' of any such copyrighted material as provided by section 107 of the US Copyright Law according to which such material can be distributed without profit exclusively for research and educational purposes.

This is a Spartan WHYFF (We Help You For Free) site written by people for whom English is not a native language. Grammar and spelling errors should be expected. The site contain some broken links as it develops like a living tree...

You can use PayPal to make a contribution, supporting development of this site and speed up access. In case is down you can use the at


The statements, views and opinions presented on this web page are those of the author (or referenced source) and are not endorsed by, nor do they necessarily reflect, the opinions of the author present and former employers, SDNP or any other organization the author may be associated with. We do not warrant the correctness of the information provided or its fitness for any purpose.

The site uses AdSense so you need to be aware of Google privacy policy. You you do not want to be tracked by Google please disable Javascript for this site. This site is perfectly usable without Javascript.

Last modified: March, 12, 2019