To do so, in Calibre, go to Preferences → Plugins, click on the Get new plugins button and get KFX Output. Once this software is installed, we can just use Calibre with the KFX Output plugin. KFX is, unfortunately, a closed language, not documented, and which requires Kindle Previewer 3, available under Windows or MacOS only. You may notice that the fifth line of the last paragraph is not justified at all! In mobi, the first line on the second paragraph is too widely spaced, and there is no ligature on “firm”. kfx is the latest update, dating from 2015 and enriched since, is the latest update, dating from 2015 and enriched since, with a new typesetting and layout engine that adds hyphens, kerning and ligatures to the text.īelow you can see three examples between mobi and kfx. azw3 in 2011 added support of some HTML5 and CSS3 features azw, launched in 2007, is a proprietary format developed by Amazon to integrate richly formatted e-book features its update. mobi, created in 2000 and progressively abandoned since 2011, is now obsolete and should really not be used today: the display of books is very poor, with a catastrophic text justification, no ligature, kerning or hyphen Since the launch of the first Kindle, several successive ebook formats have been used by Amazon for its Kindle: Import metadata and high quality covers from the Kindle store ĭisplay the covers when the kindle is turned off with the right ratio.Ĭonverting ebooks to the KFX format Why using the KFX format? Use the KFX format to get well formatted books with justification, hyphens, kerning and ligatures

While everything works “out of the box”, over time I have discovered a number of tricks that allow me to have books that are as well formatted as those in the official store, a tidy library, and good quality covers.

If the reader itself is of excellent quality, the counterpart is its very closed ecosystem, turned around the Amazon store and a proprietary format with DRM.įortunately, the fantastic Calibre software allows you to use your Kindle with your own library of books and take full advantage of your e-reader. I recently had the opportunity to play for a few days with an Amazon Kindle Paperwhite (2021). Sideload books to a Kindle with Calibre – Sylvain Durand sylvain durand Sideload books to a Kindle with Calibre

Calibre ebook store