Closed captioning your YouTube videos will boost traffic and improve search engine optimization by increasing keyword density and diversity. Manually added closed captions can be easily indexed, making it much easier for the search engines to access the keywords you mention in your videos. They also enable videos to be highly ranked in search results. Some viewers often filter their searches so that only closed captioned videos are shown.
When students, EFL, and ESL learners view close-captioned videos, their user experience is improved through cognitive reinforcement. It is much better to view close-captioned videos because they make it easier to comprehend what was being said because as the audience hears and reads the content, they can remember it much more easily than when all they did was hear. Content retention is much easier with close-captioned videos.
YouTube videos that have captions are watched 13.48% more times than those without captions, and when lifetime views are compared, the close-captioned videos are viewed 7.3% more times than videos without close captions. These statistics show that average view/watch time is boosted when videos are captioned and this is beneficial to your YouTube organic growth. Access to more keywords by search engines translates to your videos ranking higher for those keywords resulting in more people seeing your videos, and you will increase your video views and subscribers and grow your YouTube channel organically