Pinyin Web EPUB is a free Android app developed by Referenced Expressions under the Education & Reference category. Designed for Chinese language learners, it adds Pinyin romanization to any Chinese website or EPUB. The app works best on the JW.ORG and Watchtower Online Library (WOL) Chinese pages. Annotation is performed by your device itself, so your browsing is not sent through any third party.

This browser app has several features that make it a great tool for language learners. First, it rarely needs to reload pages when switching back to the app, making it a great choice for those with poor data connections. Second, it can be used offline with the clipboard viewer or as a Share target or EPUB viewer. Third, the app integrates with Pleco or Hanping for even more features. Fourth, it has a 3-lines mode for those who need it. Fifth, bookmarks are shared with other Referenced Expressions apps. Sixth, highlighting and PDF export are available. Seventh, text size can be changed across all pages. Finally, dark mode is available on Android 10+ and audio is available on Android 5+. Overall, Pinyin Web EPUB is an excellent addition to any Chinese language learner's toolbox.