All of the Welsh-language TV channel's content will be available from today (January 30) on YouView's catch-up service, allowing customers across the UK to watch S4C programmes on demand for the first time.
YouView customers in Wales had already been able to watch S4C shows such as Pobol y Cwm and Jonathan through the service before the expansion.
S4C Chief Executive Ian Jones said: "Launching S4C on the YouView platform is a significant step which will place S4C shoulder to shoulder with the UK's other main channels. Our aim is to expand the methods of watching S4C making it easier than ever for people to watch our excellent programming.
"We know that viewing habits have changed and are continuing to evolve, and the challenge for us is to respond and remain at the forefront of these changes,