Michael Roth, Germany's deputy foreign minister, applauded Macron's win but said the result was marred by the fact that 11 million people in France voted for Le Pen.
On Monday, a French national holiday, the president-elect joined President Francois Hollande in commemoration of the end of World War II.
"I will always be at his side", Hollande added. What policies are likely to be at the top of his agenda?
In an early plea for unity, Macron reached out to Le Pen's supporters after a vicious election campaign that exposed deep economic and social divisions, as well as tensions provoked by identity and immigration. "I'll be at the head of this fight", she said. Without that, Le Pen could be hard-pressed to be more than a disruptive force instead of changing the nation's course. Macron is keeping tight-lipped, even with his own team: at a meeting shortly before the first results broke Sunday evening, Macron didn't even reveal whether he had told his nominee of his choice, said the adviser.
Western leaders largely hailed the result after the shock of Britain's vote to leave the European Union and the election of Donald Trump in the United States.
Emmanuel Macron, emphatic victory, which also smashed the dominance of France's mainstream parties, will bring huge relief to European allies who had feared another populist upheaval to follow Britain's vote to quit the EU.More news: Jaylen Brown Had A Big Game With Small Minutes In Game 7
"We will not give into fear, divisions", he said after arriving while the European Union anthem "Ode To Joy" blared through the museum's courtyard.
Emmanuel Macron was confronted on Monday with pressing reminders of the challenges facing him as France's next president, even as allies and some former rivals signaled their willingness to work closely with him. "He stands for openness to the world", Merkel said in Berlin.
Jean-Claude Juncker, the President of the European Commission, welcomed the French choosing "a future in Europe".
"I look very much forward to working with him", Trump wrote on Twitter on May 7.
White House spokesman Sean Spicer said Trump called Macron on the phone to offer his congratulations.
The apparent French rejection of a far-right party has eased concern across Europe.More news: Senate panel chairman: Flynn won't honor subpoena
"I'd like to express the Islamic Republic of Iran's preparedness for steady exchange of views (with France) on bilateral, regional, and global issues", the Iranian president said.
Putin said, "The citizens of France have entrusted you to lead the country in a period that is hard for Europe and for all of world society".
"The growing threat of terrorism and militant extremism is accompanied by an escalation in local conflicts and the destabilization of entire regions".
The telegram went on: "In these condition it is especially important to overcome mutual distrust and join forces to ensure worldwide stability and security".
The move was reportedly considered during the election campaign, but not acted upon.More news: New Xiaomi Mi Max 2 will show next week
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