The app's interface is wrapped in a standard window with minimal features, where you can toggle between the library tree and reading mode.

So, you can use either the scroll mouse, arrow keys or buttons in the toolbar to navigate back and forth within the eBook, jump to a particular page and use a search function.

But you may also rotate text, view eBook information, switch to a different language for the UI, change the author names and series title, as well as add as many tags as you want.

A bunch of configuration settings are available through the Options screen. For instance, you can make the tool look for eBooks in subdirectories and collect even books without metadata.

It is also possible to select the networks to search in and configure proxy parameters, establish the number of lines to scroll, as well as to alter the default background color and page margins, just to name a few.

The simple-to-use program is backed by user documentation, has a good response time and worked well during our tests, without hanging, crashing or displaying error notifications; we haven't come across any issues throughout our testing. All in all, FBReader comes bundled with some important features for viewing eBooks, and they can be figured out by users of all skill levels.