The UK's biggest-selling Sunday national newspaper, the News of the World, is to go behind News International's online paywall next month.

News International said the website of the Sunday red-top, www.notw.co.uk, would relaunch next month with readers charged £1 for a day's access and £1.99 for a four-week subscription. A News of the World iPad app will also launch, with a separate weekly charge of £1.19.

The paper will now join stablemates the Times and Sunday Times behind a paywall, leaving the Sun as the only free-to-access News International newspaper website, although it is expected to start charging for online content in the next few months.

Consumers are charged £1 per day or £2 per week for access to the Times and Sunday Times websites.

"The News of the World website will be the third of our titles to launch a paid-for digital proposition in under four months," said Rebekah Brooks, chief executive of News International. "News International is leading the industry by delivering on its commitment to develop new ways of making the business of news an economically exciting proposition."

News International also said that access to the website of the News of the World's Fabulous magazine, which is also set to be relaunched, will be included in the subscription fee. Customers who are already registered with News International will be offered a special introductory deal at launch.

The new-look NoW website promises to showcase a "modern, innovative design, making much more of the News of the World's exclusive video and pictures", while new software will aim to produce a "slick and exciting web-friendly experience".

"This is a very significant moment in the history of the News of the World," said editor Colin Myler. "The paid site makes the most of our heritage, presenting our unique content with a real focus on exclusive video and pictures. Our new digital sites and apps will showcase our agenda-setting stories, celebrity exclusives and world-class investigative journalism, plus our unrivalled sports coverage."

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