More than 90,000 police, soldiers and private guards will be deployed at the tournament, with seven million fans expected to visit the 10 host venues as the US and British governments have both warned fans they could be at risk.
France remains under a state of emergency after last November’s attacks on Paris, when 130 people were killed.
But organisers Uefa and French authorities insist they have done everything possible to keep the 2.5 million spectators expected at the 51 matches safe.
Paris alone will have a security force of at least 13,000 to patrol two zones and two stadiums, with the country’s state of emergency allowing police extra powers to conduct searches and put people under house arrest.
France coach Didier Deschamps, whose side were playing Germany in an international friendly when the Stade de France was targeted by suicide bombers, says November’s attacks evoked “very strong emotions”.
“We lived through some tragic moments,” he said. “So it will remain with us, even if with time we can think about it a little less.
“Today to have zero risk doesn’t exist, sadly, but we have to go forward and these Euros have to be a festival of football and the festival has to be as beautiful as possible.”
Richard Walton, the Metropolitan Police’s former head of counter-terrorism, said the threat to Euro 2016 is “more acute than for any other international sporting event in history”.
With a reported 500,000 British fans among the seven million supporters in France, the British Foreign Office has warned that stadiums, fan zones and transport hubs are possible targets for attack.
England goalkeeper Joe Hart says players will adhere to the advice of security officials at the 24-team championship.
“We’re a team of footballers, but we’re a group,” he said. “We work together with the security and press officers.
“Everyone’s got their various jobs and I’m very confident on everyone completing them.”
France’s junior minister for sports, Thierry Braillard, said official fan zones are the only outdoor public spaces where screens will be installed, with bar and restaurant owners told not to host large outdoor TV broadcasts.
He added: “We can’t accept unorganized gatherings because police forces don’t have the means to secure them.”
Paris is one of nine host cities, with games also taking place in Bordeaux, Lens, Lille, Lyon, Marseille, Nice, Saint-Etienne and Toulouse.
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