FBReader is a free and customizable ebook reader that supports various formats, including ePub, PDF, Kindle AZW3, FB2, comic books, RTF, doc, HTML, and plain text. It also provides dictionary integration for foreign language assistance, allowing users to translate sentences directly in the app using a Google or DeepL translator. FBReader syncs with the FBReader book network, a Google DriveTM-based cloud service that is fast and highly customizable. It can use external TrueType and OpenType fonts, custom backgrounds, screen brightness, and day and night color schemes. The reader also includes a browser and downloader for accessing network ebook catalogs and stores, as well as custom OPDS catalogs. Users can download books manually and save them in the Books folder. 34 languages have localized FBReader, which also incorporates hyphenation patterns for 24 languages.