# [[Using the Kobo Libra Color ereader]] _Created: 2025-07-19_ | #ebooks #kobo | >[!note] Most of the content is relevant to the [Kobo Libra Color](https://ca.kobobooks.com/collections/ereaders/products/kobo-libra-colour) ereader that I have. ## The `kepub` format Obviously, books bought directly from Kobo render and work perfectly on the ereader. But epubs which have been brought from other sources, like Kindle ebooks converted by [Calibre](https://calibre-ebook.com/), don't always work very well out of the box on the Kobo reader device. I especially had problems adding highlights, particularly with the stylus. The fonts also don't render well. It turns out that like [Amazon KFX format](https://wiki.mobileread.com/wiki/KFX), Kobo has their own variation of epub, commonly called _kepub_, where it adds additional layout and styling information to make the content look better and give better navigational features. The popular [Mobileread wiki has a page](https://wiki.mobileread.com/wiki/Kepub) which gives more details about this format. ## Tools to convert to kepub [Calibre](https://calibre-ebook.com/), with the _Kobo Utilities_ plugin can directly convert the epubs when you are transferring them to a connected reader over USB. [This blog post](https://www.juliusunscripted.com/posts/calibre-setup-for-kobo-ebook-reader/) has some details. However, I prefer using [the Dropbox integration](https://help.kobo.com/hc/en-us/articles/360033830114-Add-books-to-your-eReader-using-Dropbox) to access my epubs. And therefore I prefer a tool which can convert epubs that I already have. There is a popular [kepubify CLI tool](https://github.com/pgaskin/kepubify) (conveniently installable on Mac using Homebrew) which can convert epubs to the kepub format. It is really fast and can convert a whole directory full of epubs to the Kobo format in seconds. ## Custom fonts Custom fonts can be added to Kobo by connecting the reader over USB and copying the font files to a `fonts` directory on the root. When I connected my brand new reader, this directory already existed and had some preexisting font files. [This blog post](https://the-digital-reader.com/how-to-install-bookerly-ember-roboto-and-other-fonts-kobo-ereaders/) gives more specific details about adding fonts to the Kobo reader and also conveniently provides a zip file with Amazon Kindle's default [Bookerly](https://en.wikipedia.org/wiki/Bookerly) font that you can immediately copy over to Kobo without having to hunt for fonts all over the Internet.