The centrist's 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 and Donald Trump's election as U.S. president.

Macron topped 66 percent of the vote as the interior ministry counted the final few votes in France's presidential election early on Monday.

The ministry said Macron had been elected president with 66.06 percent of valid votes cast in Sunday's run-off, after accounting for all but 0.01 percent of the country's 47 million registered voters.

A record 11.5 percent of votes cast were either blank or spoiled, while a near-record total of 25.38 percent of the registered voters abstained, the official figures showed. 

Even so, it was a record performance for the National Front, a party whose anti-immigrant policies until recently made it a pariah in French politics, and underlined the scale of the divisions that Macron must now try to heal.

Le Pen's high-spending, anti-globalisation 'France-first' policies may have unnerved financial markets but they appealed to many poorer members of society against a background of high unemployment, social tensions and security concerns.

Macron's immediate challenge will be to secure a majority in next month's parliamentary election for En Marche! (Onwards!), his political movement that is barely a year old, in order to implement his programme.

The 39-year-old former investment banker, who served for two years as economy minister but has never previously held elected office, will become France's youngest leader since Napoleon with a promise to transcend outdated left-right divisions.

At least one opinion poll published in the run-up to the second round has indicated that the majority he needs could be within reach.

Despite having served briefly as economy minister in President Francois Hollande's deeply unpopular Socialist government, Macron managed to portray himself as the man to recast a political landscape moulded by the left-right divisions of the last century.

While Macron sees France's way forward in boosting the competitiveness of an open economy, Le Pen wanted to shield French workers by closing borders, quitting the EU's common currency the euro, radically loosening the bloc and scrapping trade deals.

Socialist Prime Minister Bernard Cazeneuze said France had chosen to retain its place at the heart of Europe.

Shortly after the first projections were published, Le Pen, 48, said she had congratulated Macron. But she defiantly claimed the mantle of France's main opposition in calling on "all patriots to join us" in constituting a "new political force".

Her deputy said this new force would not be called "National Front".

When he moves into the Elysee Palace after his inauguration next weekend, Macron will become the eighth - and youngest - president of France's Fifth Republic.

He plans to blend a big reduction in public spending and a relaxation of labour laws with greater investment in training.

A European integrationist and pro-NATO, he is orthodox in foreign and defence policy and shows no sign of wishing to change France's traditional alliances or re-shape its military and peace-keeping roles in the Middle East and Africa.

His election also represents a long-awaited generational change in French politics that have been dominated by the same faces for years.

He will be the youngest leader in the current Group of Seven (G7) major nations and has elicited comparisons with youthful leaders past and present, from Canadian Prime Minister Justin Trudeau to British ex-premier Tony Blair and even President John F. Kennedy in the United States.