It will remove both the custom fonts inside the book and the references to them on the CSS. Not easy, likely a steep learning curve, and probably a lot of time, though. You could take this book (assuming it has no DRM) and export the fonts and css, then apply them to some other book. Once you have installed it, select the epub files you want to modify this way, click the Modify Epub icon on the toolbar, and select the corresponding option, as shown on the picture. It's certainly possible, if you are willing to learn a bit of html and css coding, and how the Calibre editor works. If you really want to change the font used during reading, you should edit the CSS file(s) inside the epub and remove all references to any defined font.Ĭalibre also has a plugin called Modify Epub that, amongst other things, let you remove internal font settings from an epub file. You should look at the default settings in Calibre as a fall-back in case the book doesn't provide any information in this sense. This version of Dr Jekyll and Mr Hyde, always from MobileRead, doesn't contain any font definition in its CSS and it uses the default one as defined by Calibre. You can try this yourself: this version of Treasure Island from MobileRead include font definitions for the text, and it keep using it even if you change the standard one on the Calibre settings. Maybe the ebook you are reading has some CSS rules that define the default font to use on the book itself (and probably the ebook even includes the said fonts). If the ebook contains some definitions about the fonts to use, it takes the precedence over the default Calibre settings.
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