Le Pen, 48, said she had also offered her congratulations.
Ms Le Pen said she had called the 39-year-old to concede defeat after voters rejected her "French-first" nationalism by a large margin.
Macron will now have to prove that he can tackle France's economic malaise by boosting growth and employment - and he may have to do that without a big majority in parliament.
He later strode alone nearly grimly through the courtyard of the Louvre Palace in central Paris to the strains of the European Union anthem, Beethoven's Ode to Joy, not breaking into a smile until he mounted the stage of his victory rally to the cheers of his partying supporters.
The premium investors demand to hold 10-year French government debt over German equivalents tightened to its lowest since early November after centrist Emmanuel Macron won the French presidency on Sunday.More news: NASCAR star Dale Earnhardt Jr. to retire at end of season
A spokesperson for the Chancellor said on Twitter: "Congratulations Emmanuel Macron".
If he can get his reforms through, he'll be in a stronger position to work with Germany and other countries that use the euro to push forward the region's recovery.
"The French have chosen a new President of the republic and have voted for continuity", Le Pen told her supporters after conceding to Macron. Macron says that France is facing an "immense task" to rebuild European unity, fix the economy and ensure security against extremist threats. "We said in January that this was going to be a make-or-break year for Europe and this is a positive".
While differing on nearly every domestic policy, the two candidates also had very divergent views on foreign policy.
Since the first round of the election - in which Macron edged Le Pen by 24 percent to 21.3 percent - the leader of the En Marche!More news: Mario Kart 8 Deluxe gets off to good start in the US
Jean-Claude Juncker, president of the European Commission, told Macron: "I am delighted that the ideas you defended of a strong and progressive Europe, which protects all its citizens, will be those that you will carry into your presidency". (Forward!) political party has accused Russia of meddling in his election campaign with cyberattacks and refused to accredit Russian media outlets RT and Sputnik, accusing them of issuing fake news stories. "Macron by a mile", it said.
Macron's political movement En Marche compared the hack with the leak of Democratic Party e-mails in last year's US presidential election that was blamed on Russian hackers.
Macron, by contrast, embraced globalization, winning an unusually high-profile endorsement last week from former President Barack Obama.
The French president is elected to a five-year term.More news: Kim Jong-un is smart cookie