Users of Film4oD, the movies on-demand service launched in November 2010, can now save films to their computers or other devices for the first time to be watched while offline.
Developed by FilmFlex, the initiative has been designed to suit users with too low bandwidth for the site's streaming service, or anyone who wants to watch films while not connected to the web.
Film4oD's more than 50,000 registered users will be able to download various new release movies, including Attack The Block and Arthur on the same day they are released on DVD.
All movie rentals offer unlimited viewing for up to 48 hours following the first play. The films are protected by digital rights management technologies and the service is only available in the UK.
"FilmFlex continues to innovate using the latest technologies to allow our clients to offer the very best movie service to their customers," said Jeff Henry, chief executive of FilmFlex.
"The download to rent service makes it easier for those with low bandwidths or those on the go to enjoy the greatest selection of movies online.
"Download to rent is yet another enhancement of our offering to our brand partners as we continue to extend FilmFlex's leading white-label position into new platforms and new markets."
Film4 head Julia Wrigley added: "Video on-demand continues to soar in popularity with viewers enjoying the freedom to watch their preferred content on their own terms.
"We're excited to extend our relationship with FilmFlex to offer 'download to rent', further strengthening the viewer experience alongside the Film4oD online streaming and Film4 channel."