iTunes on the Mac, and the Videos app on iOS, both have great support for subtitles. You can add subtitles for multiple languages, and the iOS 11 video player can even pull in subtitles from YouTube videos. Subtitles help out of you have hearing loss, or if you’re watching shows and movies in a foreign language. And a lot of the time, actors are so mumbly that having subs is essential to follow the story, even in your own language, and with the sound jacked up. But unless you’re buying movies and TV shows from the iTunes store, how do you add subtitles to your videos? The good news is that it’s easy, and once you’ve bought our preferred app — SubsMarine — it’s also free.