There are probably lots of EPUB reader apps for Android. However, Play Books remains the best one as it is developed by Google. In addition to ebooks you bought from the book stores within the app, Play Books also allows you to upload ebook files you downloaded from other sources. Be it in EPUB or PDF format.
Yes, Play Books is the best app to open EPUB files on Android. However, this app is not installed by default on some smartphone models. Before being able to use the app, you can install it via Play Store. Google allows you to upload up to 1,000 ebook files to Play Books with the maximum size for each file is 100 MB.
There are two ways to upload an EPUB file to Play Books.
1. How to upload an EPUB file from desktop
Uploading an EPUB file to Play Books via your desktop computer is easier than Android device. To do so, open your web browser and go to the Google Play Books website and click My books on the upper right side. But first, make sure you login with the same Google account as the account you use on your Android device.
On the next page, you will see an Upload files button on the upper-right corner of the screen. Click this button and select an EPUB file you want to upload.
Wait a moment until Play Books is done processing your EPUB file. Once done, you can find it on your Play Books library.
2. How to upload an EPUB file from Android device
As mentioned, uploading an EPUB file via desktop is easier than Android device. Play Books has no in-app feature to allow you to upload an ebook file. To be able to upload an EPUB file to Play Books via your Android device, you need to enable the Enable PDF uploading option on the Play Books app. To do so, open Play Books and tap the three-line icon on the top-left corner and select Settings.
On the Settings screen, tick the Enable PDF uploading option.
Exit the Play Books app. To upload an EPUB file, go to the location of the EPUB file you want to upload using your favorite file manager. Simply tap the EPUB file and it will automatically be uploaded to Play Books. Once Play Books is done processing your file, you can find on the library.