The Press Council will offer membership to blogs and digital media and will get tougher powers for dealing with complaints.
The move follows a review by the council's main funder, the Newspaper Publishers' Association, after considering recommendations by the Press Council and a Law Commission Report.
Association editorial director Rick Neville said most publishers felt the time had come to strengthen the council's authority and extend its coverage to handle complaints against digital media, including blogs.
"The media world is changing and fragmenting. It's important that a body set up to maintain high standards, and provide an avenue for reader complaints, keeps pace with those changes," he said.
Press Council chairman, former High Court judge Sir John Hansen, said he welcomed broadening the council's remit.