The two most popular eBook formats are ePub and KF8. ePub is used by Apple, Barnes & Noble, Kobo, Sony, and many other retail channels. KF8 (formerly Mobi), on the other hand, is a proprietary format used only by Amazon.

Vook makes it a snap to design eBooks in both ePub and KF8 formats, because you can quickly create an eBook in either format on the Preview page.

ePub and KF8, though, support different settings in the Style editor. We’ve outlined them on the guide, but you can see what I mean simply by creating eBook previews in both formats.

Because the formats can be so different, we often hear the question: I want to style my eBook specifically for Amazon. How can I duplicate a project in progress?

Here’s how to do it in three easy steps:

1. Create an ePub preview. Make sure you select “Apple iBooks and Barnes & Noble Nook (ePub).” Click Get It to download the ePub to your computer.

2. Start a new eBook project. Then go to Upload+File Manager and drag and drop your ePub onto “Upload Files”. (Remember, Vook imports ePubs too!)

3. Delete the first chapter. Go to the Content editor and delete the first chapter—if you don’t, you won’t be able to preview this new book.

4. Change the Style to use from “default.css” to “stylesheet.css”.

And that’s it—you’re done!

One caveat: this method won’t import any videos or audio files in your ePub, so just quickly upload them again.

This tip can be used for both duplicating eBooks and versioning or backing them up. You can always roll back to an earlier version of your project by creating a new eBook, importing an earlier ePub, and then deleting the old project.