Vienna - After Austria and the Netherlands, the defeat of France's Marine Le Pen in a presidential run-off in early May was a new blow for the European far-right, but its march to power is far from over, analysts say.

Victory appeared tantalisingly close for the 48-year-old, who had hoped to finish what her father had failed to achieve in 2002: win the election's second round and save "the French civilisation" from the clutches of globalisation.

Her campaign tapped into fears over high unemployment, immigration and the rising threat of jihadist terror attacks.

But Le Pen's intention to leave the eurozone proved a red flag to many and the presidential crown went to the pro-EU Emmanuel Macron, who bagged 66 percent of the vote against his rival's 34 percent.

The French outcome is the third setback for Europe's far-right in six months.

In December, Austrian Norbert Hofer of the Freedom Party (FPOe) failed narrowly to win a presidential re-run vote.

This was followed by the defeat in March of anti-Islam MP Geert Wilders in Dutch elections.

But some analysts say these are just stumbling blocks for the far-right, which has been buoyed by Britain's decision to quit the European Union and Donald Trump's upset victory in the US election.

Far-right movements "exert their influence not by governing, but by constraining the room for manoeuvre for centrist parties," said Carsten Nickel of the Teneo think-tank in Brussels.

"We can't talk of a bad year for the far-right. In Austria, Hofer got close to 50 percent. In the Dutch case, the traditional centre-left has been completely wiped out and Geert Wilders is a serious player in parliament," he added.

Wilders' Freedom Party gained five seats in March, making it the second-largest party in the Dutch parliament with 20 MPs.

And while Macron's win against Le Pen was "a good result", it's "much weaker" than the crushing defeat suffered by her father Jean-Marie Le Pen at the hands of Jacques Chirac in 2002, Nickel said.

In fact, the result was the highest-ever score in a presidential election in the FN's 44-year history.

In her concession speech, Marine Le Pen hailed the FN as France's main opposition player and proclaimed a new faultline has been drawn "between patriots and globalists".

"Let's not fool ourselves: the score shows that... there is a real desire for far-right extremism in the population," French historian Nicolas Lebourg told French newspaper Liberation.

Le Pen's European allies also struck a decidedly optimistic tone.

"Well done anyway, millions of patriots voted for you! You will win - and so will I," Wilders messaged Le Pen on Twitter.

"Thanks Marine Le Pen, those who fight never lose," Matteo Salvini of Italy's far-right Northern League wrote in a Facebook post.

In Austria, FPOe leader Heinz-Christan Strache said the result paved the way for another "historic" success in France's parliamentary elections in June.

The FPOe itself is riding high in opinion polls and hopes to win Austria's parliamentary elections due in late 2018.

Austrian Chancellor Christian Kern, a Social Democrat, cautioned that Macron's win was merely a "stage victory".

Le Pen "still took more than a third of the votes cast, and the consensus is that she will be a far more significant force come 2022 if France follows its current economic trajectory," London-based economic analyst Peter Ashton said.

European media outlets also warned against minimising the anti-EU threat.

"Far-right populists in Austria, the Netherlands, Germany and France... are probably stronger than ever and nothing indicates that they will disappear," said Sweden's Svenska Dagbladet.

"Mr Macron needs to show the French people that he is indeed the alternative they were waiting for. If he cannot, Ms Le Pen or perhaps another Le Pen will be waiting," said Britain's Times newspaper.

Nonetheless, observers say fears of the far-right destroying the European Union have proven unfounded.

"The recent elections have shown that the far-right doesn't suddenly sweep away traditional parties but takes root progressively," Berlin-based analyst Josef Janning told AFP.

"Even if people feel uneasy about globalisation, the economy and immigration, they understand that the far-right offers more wishful thinking than credible strategies to solve these problems," he said.

According to Janning, this explains why Le Pen announced that the FN would be transformed into a "new political force".

"She senses that she cannot afford another major loss so I see her trying to capture the conservative spectrum."

For some, the political overhaul could mean a new FN leader.

The "defeat will be politically fatal for Le Pen. Her opponents inside the party and even in her own family will make her pay the price," wrote Italian journalist Bernardo Valli in the Repubblica newspaper.

By Nina Lamparski with AFP's European bureaus