Le Pen published a list of 144 "commitments" to the nation, which include pulling France out of the eurozone, imposing higher taxes on the employment contracts of foreign workers and freeing small firms from red tape.
The 48-year-old leader of the National Front (FN) favours an overhauled European Union without a single currency.
But she says in her "commitments", published in a pamphlet and on her website, that if France's European partners refuse to agree, she will hold a referendum soon after taking power on whether France should remain in the bloc.
However, polls also show she would be beaten in the May 7 runoff, possibly by centrist former banker Emmanuel Macron who has benefited from claims that conservative candidate Francois Fillon arranged high-paying parliamentary jobs for his wife and children.
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"On paper, Macron has the strongest chance of winning," one of Le Pen's advisors conceded today, speaking on condition of anonymity.
In the wake of the attack on a soldier near the Louvre museum in Paris yesterday that has re-awakened security fears in France, Le Pen also promises to "massively" arm the police while eradicating weapons in the troubled suburbs of French cities.
Le Pen hopes to capitalise on the same rejection of mainstream politics that helped the Brexit camp win in Britain and swept Donald Trump to the US presidency.
She has worked to rid the FN of its more extremist, anti-Semitic fringe since taking over from her father Jean-Marie Le Pen, who has repeatedly referred to the Nazi gas chambers as a "detail" of history.
Her conservative rival Fillon had been the long-time frontrunner in the presidential race but he has lost support since allegations emerged that his wife Penelope earned more than 8,00,000 euros (USD 8,60,000) as a parliamentary aide without apparently ever working in the National Assembly building.
Florian Philippot, one of the FN's vice presidents, called yesterday for Fillon to withdraw from the presidential race.
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