NFS, Netflix Subtitle File (.nfs)
The NFS Data file format
In December 2016, the popular streaming service Netflix introduced a feature that allows users of their Android and iOS app to watch TV shows, movies, and other content on Netflix offline. This feature is not available for all content on Netflix, but for many popular TV shows and movies, documentaries and, of course, Netflix original productions. Since these offline downloads also retain the option to choose subtitles, Netflix developed the NFS file to store the subtitle information of downloaded shows or movies in.
Technical details of NFS files
By allowing users to download their favorite shows or movies, the need to have a safe way to store this content on a user’s phone arose for the Netflix streaming app. Thus, they developed a variety of files that enable users to enjoy Netflix even when they do not have an internet connection. NFS files are only part of the conglomerate of files developed for this purpose. They store information about subtitles in different languages, such as English, French, German, Spanish, and many more. These files can be found on the device the episode or movie was downloaded to, together with other Netflix files needed for offline viewings, such as the NFV, NFA or MANIFEST files.