But she proposed Europe could return to a parallel Ecu-like common unit in a bid to soften the economic impact.
Meanwhile, a rival for the left-wing nomination, Arnaud Montebourg, said he would impose a super-tax on banks to raise €5bn (£4.3bn; $5.2bn) if elected.
French voters will elect their new president in April and May.
Polls at present suggest that conservative candidate Francois Fillon, who decisively won the centre-right nomination in November`s primary vote, will face National Front (FN) leader Ms Le Pen in the second round of voting.
Ms Le Pen has vowed to pull France out of the euro for years, but in remarks to Reuters news agency she broadened her vision, suggesting that Europe could return to a basket of recognised national currencies, linked through a common currency system like the Ecu, used before the introduction of the single currency in 1999.
Under this model, France could reintroduce a currency such as the franc, while maintaining economic relationships with the eurozone.
FN leader Le Pen calls for France to leave euro but stay linked
06 January 2017
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France`s far-right leader Marine Le Pen has outlined plans for France to leave the euro should she win this year`s presidential election.
