The first man charged under WA's new revenge porn laws has pleaded guilty to posting intimate images of his ex-girlfriend on Instagram after their relationship broke down.

Mitchell Brindley, 24, admitted in Fremantle Magistrates Court on Tuesday to creating multiple Instagram accounts in his former partner's name, and posting 10 intimate images of her without her consent between April 19 to 23 this year – just days after the new law came into effect.

Mitchell Brindley, 24, is the first West Australian to be charged under new revenge porn laws. Credit:Facebook

The charge carries a potential jail term of up to three years and a fine of up to $18,000.

Dressed in a suit, Brindley spoke only to confirm his name and to plead guilty to the charge of "without consent distributed an intimate image of another person".