Films can be legally downloaded from Internet Archive, which offers movies available in the public domain. Other services don't allow downloading movies, as they are only available for streaming due to copyright laws.
Internet Archive features a wide variety of freely accessible media, including video games, music, TV shows and movies. These movies are free to download, as they are either original content uploaded by users, or old movies for which the copyright has expired. Most movie services, such as Netflix and Hulu, only allow movies to be streamed, as allowing downloads would give users the ability to copy and distribute them illegally.