Elsewhere, a thousand people braved driving rain in Rome while similar protests drew several hundred demonstrators in Geneva and Athens on the eve of the UN's International Day for the Elimination of Violence Against Women on Sunday.

In Spain's capital Madrid, several hundred people took to the streets to march to loud drumming as some shouted "We are all here, the murderers are missing".

Authorities put the Paris turnout at 12,000 and similar marches in Lyon, Marseille and Rennes at between 1,000 and 2,400, but De Haas felt moved to salute "the largest (feminist) mobilisation France has known", far bigger than a rally that drew some 2,000 last year.

French President Emmanuel Macron offered his support, tweeting: "The fight against violence against women is progressing daily but our society has a long way to go -- everyone must act and fight as this is everybody's business."

Participants clad in purple, the colour of the #NousToutes women's activist protest movement, shouted slogans including "sick of rape", "end impunity for aggressors" and "a woman is never responsible for the violence she suffers", while also demanding sufficient government resources to tackle the issue.

"I am here to support all the victims and continue this struggle which started long before I came along," said French actress Muriel Robin, who had organised a similar rally last month in the capital.

- Rise in violence cases -

The rallies drew a number of men, including Tanguy, a 19-year-old student who turned out in the western city of Rennes to declare backing for "a movement which is not based on sex -- it's not a fight pitting men against women but a fight by men and women, together, against inequality."

The #NousToutes movement started out in France in September, inspired by the #MeToo campaign that began last year since when the number of cases of sexual violence reported to police in France has risen 23 percent.

Latest French government figures say 2017 saw 225,000 cases of domestic violence against women by their partners while 2016 saw 123 deaths.

Further marches are planned for Sunday in a number of cities across Europe to mark the International Day for the Elimination of Violence Against Women.

Macron last year made sexual equality a priority of his presidency.

But "if the money is not forthcoming public policy won't follow on", warned De Haas, speaking two days after several civil organisations called for a huge increase in public resources dedicated to the problem.

French Prime Minister Edouard Philippe announced on Saturday that an online platform for reporting sexual violence and sexism will be launched on Tuesday.

"This is the first milestone, technical and political, to eradicate" violence, said he said in a Facebook post.

"From now, a few clicks can help everyone make a new start: for themselves, for their family. And perhaps avoid the worst." (AFP)