A victory in Sunday's runoff vote would make Macron the first French president in 20 years to win a second term.
All opinion polls in recent days converge toward a victory for the 44-year-old pro-European centrist, yet the margin over his nationalist rival appears uncertain, varying from 6 to 15 percentage points, depending on the poll.
Polls also forecast a possibly record-high number of people who either vote blank or stay at home and don't vote at all in this second and final round.
The April 10 first-round vote eliminated 10 other presidential candidates. Who becomes France's next leader will largely depend on what people who backed those losing candidates do on Sunday.
The question is a hard one, especially for leftist voters who dislike Macron but don't want to see Le Pen in power either. A second term for Macron relies in part on their mobilization, prompting the French leader to issue multiple appeals to leftist voters in recent days.
``Think about what British citizens were saying a few hours before Brexit or (people) in the United States before Trump's election happened: `I'm not going, what's the point?' I can tell you that they regretted it the next day,'' Macron warned this week on France 5 television.
``So if you want to avoid the unthinkable ... choose for yourself,'' he urged hesitant French voters.
The two rivals both appeared combative in the final days before Sunday's election, including clashing Wednesday in a one-on-one televised debate.
Macron argued that the loan Le Pen's party received in 2014 from a Czech-Russian bank made her unsuitable to deal with Moscow amid its invasion of Ukraine. He also said her plans to ban Muslim women in France from wearing headscarves in public would trigger ``civil war'' in the country that has the largest Muslim population in Western Europe.
``When someone explains to you that Islam equals Islamism equals terrorism equals a problem, that is clearly called the far-right,'' Macron declared Friday on France Inter radio.
In his victory speech in 2017, Macron had promised to ``do everything'' during his five-year term so that the French ``have no longer any reason to vote for the extremes.''
Five years later, that challenge has not been met. Le Pen has consolidated her place on France's political scene, the result of a years-long effort to rebrand herself as less extreme.
Le Pen's campaign this time has sought to appeal to voters struggling with surging food and energy prices amid the fallout of Russia's war in Ukraine. The 53-year-old candidate said bringing down the cost of living would be a top priority if she was elected as France's first woman president.
She criticized Macron's ``calamitous'' presidency in her last rally in the northern town of Arras.
``I'm not even mentioning immigration or security for which, I believe, every French person can only note the failure of the Macron's policies ... his economic record is also catastrophic,'' she declared.
Political analyst Marc Lazar, head of the History Center at Sciences Po, told the AP he thinks that Macron is going to win again. Le Pen ``has this lack of credibility,`` he said.
But if Macron is re-elected, ``there is a big problem,`` he added. ``A great number of the people who are going to vote for Macron, they are not voting for this program, but because they reject Marine Le Pen.''
He said that means Macron will face a ``big level of mistrust'' in the country.
Macron has vowed to change the French economy to make it more independent while protecting social benefits at the same time. He said he will also keep pushing for a more powerful Europe.
His first term was rocked by the yellow vest protests against social injustice, the COVID-19 pandemic and the war in Ukraine. It notably forced Macron to delay a key pension reform, which he said he would relaunch soon after reelection, to gradually raise France's minimum retirement age from 62 to 65. He says that's the only way to keep benefits flowing to retirees.
The French presidential election is also being closely watched abroad.
In an opinion piece Thursday in several European newspapers, the center-left leaders of Germany, Spain and Portugal urged French voters to choose him over his nationalist rival. They raised a warning about ``populists and the extreme right'' who hold Putin ``as an ideological and political model, replicating his chauvinist ideas.''
A Le Pen victory would be a ``traumatic moment, not only for France, but for European Union and for international relationships, especially with the USA,`` Lazar said, noting that Le Pen ``wants a distant relationship between France and the USA.''
In any case, Sunday's winner will soon face another obstacle to be able to govern France: A legislative election in June will decide who controls a majority of seats in France's National Assembly.
Already, the battles promise to be hard-fought.