The building was not only repaired, but also cleaned of centuries’ worth of dust and soot from the fire.
In a speech, Macron paid tribute to the craftspeople who had worked on the refurbishment.
“The blaze at Notre-Dame was a national wound, and you have been its remedy through will, through work, through commitment,” he said.
“I am so deeply grateful, France is so deeply grateful,” the president said, adding: “You have brought Notre-Dame back.”
Prince William last visited Paris in 2017, when he travelled to the French capital with his wife Catherine, Princess of Wales, for a two-day trip.
The reopening, taking place throughout the weekend, includes the ritualised opening of the cathedral’s massive doors, the reawakening of its thunderous organ and the celebration of a first Mass.
According to the cathedral’s rector, tickets for the first week of Masses to be held in the restored church were snapped up within 25 minutes of going on sale.