A French busker accused of cutting a lock of hair from a spectator during his performance has been given a spent conviction in Fremantle Court, south of Perth.

Mime artist Rodolphe Couthouis was charged with assault following the incident during one of his routines at last weekend's Fremantle Street Arts Festival.

Police say he had not been given permission to cut the woman's hair and she had pressed charges.

Fremantle mayor Brad Pettitt has confirmed that the council, which organised the festival, has agreed to pay for a new haircut for the woman and has offered her a meal for two in the port city.

Dr Pettitt says the chunk of hair was believed to be about 10 centimetres long.

It is believed Mr Couthouis snipped the ringlet to put it on a balding man's head as part of his 'Blah, Blah, Blah' street theatre show.