ePub reader

Free. Open source. Browser-based.
Open App


  • Search in book
  • Image preview
  • Custom typography
  • Highlight and Annotation
  • Theme
  • Share/Download book with link
  • Data export
  • Cloud storage

Progressive web app

Flow is progressive web app (PWA), which means it is cross-platform and installable.

Offline first

Flow can be run offline (after installation), and when not offline, Flow will update automatically.

Grid layout

Flow supports (horizontal) grid layout, which allows you to read multiple books at the same time.

Custom cloud storage

Store your books, notes, reading progress and even other data in the cloud you specified.

Frequently asked questions

How to install or uninstall Flow?

Google Chrome: Use Progressive Web Apps
Microsoft Edge: The user experience of PWAs
Safari: Use Safari web apps on Mac

How to set Flow as the default ePub reader?

Google Chrome: How to set Flow as the default ePub reader?

Where are my data stored?

Your data is stored locally in your browser, using IndexedDB. If you upload a book, there will be a remote copy in the cloud.

How to clear my data?

Local data: clear the browser cache.
Remote data: select and delete the book you want to clear (this will also clear the local one).

What cloud storage do you support?

Only Dropbox for now.