It is legal to watch movies online for free at certain sites, including Hulu and Crackle. These sites are affiliated with Hollywood studios and production companies, making their free movies completely legal to watch.
Hulu is best known for free TV streaming, but the site also hosts free movies in the genres of drama, comedy, horror and action. The site’s partnership with the Criterion Collection also gives Hulu a selection of art house classics.
Crackle is affiliated with Sony Pictures, giving the site access to popular Hollywood films starring prominent actors. The site does require users to watch advertisements during movies, but these interruptions are brief and limited.