The developers of the e-book manager Calibre have released Calibre 5.0, more precisely Calibre 5.0.1, for all supported platforms on September 25, 2020. The new version is the first major upgrade after the release of Calibre 4.0 in 2019; it offers new features such as highlighting, improved searching, and dark mode support in additional program areas.
Things have not changed compatibility-wise. Calibre 5.0 is available for Windows 8 and up, Mac OS X, and Linux officially. Mobile users may connect their devices to Calibre to manage ebooks on these devices as well. Windows users can download an installer or a portable version.
Calibre users who rely on plugins, add-ons for the e-book reader that extend functionality, need to be aware that some of the plugins may not work anymore in the new version. The e-book manager uses Python 3 in version 5.0 as Python 2.x is no longer supported, and that means that plugins need to be updated to remain compatible. If you are using plugins in Calibre, you may want to check out this forum thread to find out more about support for particular plugins that you are using. Windows users can also download the portable version and run Calibre to see if their plugins continue to work.
One of the new features of the release is support for highlights. All it takes to use the feature is to highlight text in a document and select the highlight button afterwards to highlight it. Highlights support notes and you may change the color of the highlight as well, e.g. to group highlighted content.
A click on the highlights button in the viewer controls displays the list of all highlights of the book sorted by chapter. If you prefer a global view, you can select view and then browse annotations to get a list of all highlights in all books in the library.
Calibre 5.0 features a number of additional improvements. The content server and e-book user interfaces support dark mode, the content server's in-browser viewer supports bookmarking, bookmarks and highlights are synced automatically across devices, the e-book viewer supports right-to-left and vertical text documents, and search has been made more powerful by improving the regular expression engine.
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