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Old 09-29-2019, 02:25 PM   #2
jackie_w
Grand Sorcerer
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Posts: 5,786
Karma: 14403332
Join Date: Sep 2009
Location: UK
Device: Kobo: H2O, GloHD, KA1, ClaraHD, Forma
I've paraphrased these notes from one of my posts in the kobopatch request thread. I may need to refer to them later in this thread.


Important general info about customising font-family in the Kobo GUI. It is particularly relevant to users who mainly read standard epubs rather than kepubs.

After a full reboot, as far the GUI is concerned, the Kobo only has immediate access to a limited number of its built-in fonts, Georgia, Avenir and possibly one or more of the CJK fonts. The rest of its built-in fonts and all your sideloaded custom fonts are only loaded "as necessary". I don't know the exact rules, only what I've observed.

After a full reboot I've always found that the following will force the Kobo to access all fonts. You won't have these problems if you only put the Kobo to sleep.
  1. Open any kepub. It's as easy as that for users who only read kepubs.
  2. If you open a standard epub and you don't see the custom font you were expecting (in the GUI not the book's text)
    • Press the [Aa] font menu button. You don't need to do anything else, just close it again.
    • If you still don't see the font, force the Kobo to re-render by paging across a chapter file boundary, then page back again. Or, closing the book and opening a different one might work, too.

N.B.: *** Update for firmware 4.21.15015+ ***

It is now possible to avoid having to do the above after every reboot. See the *** Update in the post #63 Summary for more details.

Last edited by jackie_w; 05-26-2020 at 05:54 PM. Reason: updated info for fw 4.21.15015
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