Le Pen faces a maximum sentence of three years in prison and a fine of 75,000 Euros ($85,000 US).
Last year, an investigative magistrate called for Le Pen to undergo psychiatric tests in connection with the IS tweets.
The 50-year-old trained lawyer, whose party topped France's vote in the recent European elections, has denounced the case as a violation of her freedom of expression.
She tweeted the images after a French journalist drew a comparison between Islamic State group and her party. -France24
Last year Le Pen, 50, was ordered to undergo a psychiatric evaluation to see if she was fit to stand trial. She has denounced the entire affair as a violation of her freedom of expression.
"I am being charged for having condemned the horrors of Daesh," Le Pen said last year. "In other countries this would have earned me a medal."
