Speaking to journalists on the Papal Plane on his way to Rome, the Express reported the Pope said: "There is dirty content, pornography, semi-pornography.
"There are parents that are very worried and don't let their children have computers in their bedroom but in a common place."
He added that spending too much time spent on a computer could lead to a "psychological illness".
"When it takes away from communal and family life, social life, sport, art, and we remain attached to our computers, this is a psychological illness. This is certain,” he said.
Speaking on the plane, Pope Francis said it was "bad for the soul" for children to be too attached to their computers.
He added: “It makes you a slave to your computer.”
The Pope did however accept that the modern world is full of technology and it is something we can't ignore. He described this reality as "the progress of mankind".
The Pope does have a Twitter account with more than six million followers, which he regularly uses.
However, he told an Argentinian newspaper in May he had not watched television since 1990.
Last summer, he urged young people not to waste time on the internet.
According to the Independent, he said: "The products of technological progress, which should simplify and improve the quality of life, distract attention away from what is really important".
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