The subtitles are suitable for non-Welsh speakers, mixed language homes and the deaf and hard of hearing.
The Welsh language subtitling service is aimed at Welsh learners as well as Welsh speaking deaf or hard of hearing viewers, learners and those who lack confidence in speaking Welsh, to enjoy the programmes on S4C.
An audio description service is provided for the blind and partially blind through the medium of Welsh. This service contains additional descriptions to enhance the viewers' enjoyment.
Some programmes on S4C are shown with a British Sign Language interpreter at the side of the screen.
S4C can be viewed in or outside Wales, and also online.