BOOX Note Air 4 C · Customization
Add your own fonts to the BOOX Note Air 4 C
Put TrueType or OpenType fonts in the BOOX fonts folder so the stock NeoReader app can use them, and how third-party apps handle their own.
Fonts on the Note Air 4 C work at two levels: the BOOX “fonts” folder feeds the stock NeoReader app, and each third-party reading app has its own font folder and picker. There is no single system-wide reading font, so if you use more than one app you may need to add the font in each. File naming does not matter the way it does on a Kobo — the apps read the family from inside the file.
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Gather the font files
You need files ending in ".ttf" or ".otf". Copy the whole family — regular, bold, italic, bold-italic — so styled text renders correctly.
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Copy them to the BOOX fonts folder
Connect the Note Air 4 C by USB in "File transfer" mode, or use a microSD card. In internal storage there is a "fonts" folder (create it at the root if it is missing). Copy your font files there.
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Select the font in NeoReader
Open a book in the stock NeoReader app, tap the centre for the menu, open the font settings, and pick your font — added fonts appear alongside the built-in ones. You can also set a default font for all books in NeoReader's settings.
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For third-party reading apps, use their own import
KOReader, Moon+ Reader and similar apps keep their own font folders and settings. In KOReader, put fonts in "koreader/fonts" (or use its font import), then choose them from the reading menu. A font added for NeoReader is not automatically available in KOReader.
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Restart the app if a font does not appear
If a newly added font is missing from the list, fully close the reading app from the recent-apps view and reopen it so it re-scans the folder.