Download Caliber 4.0

Version 4.0 of Caliber has been released. Caliber is an open source ebook management program and is available for Windows, Linux, and macOS. Among other things, it can look up all relevant information and cover images, and convert e-books to make them suitable for the various types of e-readers. Furthermore, the program can convert newspapers, magazines and news articles based on RSS feeds into e-book format. Books can also be purchased with Caliber at the well-known web stores. In version 4.0 we find a completely renewed Content Server, there is a new ebook viewer and Qt WebKit has been replaced by Qt WebEngine.

New in caliber 4.0

Welcome back, caliber users. It has been two years since caliber 3.0. This time has been spent mostly in making the caliber Content server ever more capable as well as migrating caliber itself from Qt WebKit to Qt WebEngine, because the former is no longer maintained.

The Content server has gained the ability to Edit metadata, Add/remove books and even Convert books to and from all the formats caliber itself supports. It is now a full fledged interface to your caliber libraries.

The change to use Qt WebEngine has entailed a complete rewrite of various parts of caliber, including the E-book Viewer, PDF Output, Book details etc. Every attempt has been made to preserve features and functionality in a backwards compatible way, see below for a list of some known incompatibilities.

• The new Content server capabilities
  The server has gained all the major capabilities of the main caliber interface. You can now edit metadata, convert books, and add/remove books and formats just as is possible with caliber itself. To see a brief tutorial describing how to access these features via the server interface, click here.
• All new Ebook viewer
  The caliber builtin E-book viewer has been completely rewritten. The new design emphasizes the book text, with no visible controls. The viewer now also shares a codebase with the in-browser viewer which will make developing new features such as the upcoming support for annotations much easier.
• Backwards incompatibilities
  There are a few minor backwards incompatibilities to be aware of in caliber 4, because of the replacement of Qt WebKit with Qt WebEngine.
  • The Book details panel now no longer uses a full browser engine for rendering. This makes it faster and less resource intensive, however it supports less HTML and CSS, which means if you used advanced styling in your comments it may not fully work. see here for the supported HTML subset.
  • The markup needed for header and footer templates when converting to PDF has changed. see the manual for details.

This is an appropriate time to throw out a big thank you to the caliber community who have contributed selflessly of their energy and enthusiasm — without which many of the features above would never have seen the light of day.

Note that some of these features were actually introduced during the lifetime of the 3.x series. This document describes new features as compared to 3.0

See what was new in previous major caliber releases: 3.0, 2.0, 1.0, 0.9, 0.8, 0.7.