Last week, Tim Berners-Lee, inventor of the World Wide Web, asked me to come and see a project he has been working on almost as long as the web itself. It’s a crisp autumn day in Boston, where Berners-Lee works out of an office above a boxing gym. After politely offering me a cup of coffee, he leads us into a sparse conference room. At one end of a long table is a battered laptop covered with stickers. Here, on this computer, he is working on a plan to radically alter how all of us live and work on the web.

“The intent is world domination,” Berners-Lee says with a wry smile. The British-born scientist is known for his dry sense of humor. But in this case, he is not joking.

This week, Berners-Lee will launch Inrupt, a startup that he has been building, in stealth mode, for the past nine months. Backed by Glasswing Ventures, its mission is to turbocharge a broader movement afoot, among developers around the world, to decentralize the web and take back power from the forces that have profited from centralizing it. In other words, it’s game on for Facebook, Google, Amazon. For years now, Berners-Lee and other internet activists have been dreaming of a digital utopia where individuals control their own data and the internet remains free and open. But for Berners-Lee, the time for dreaming is over.