The defensive midfielder becomes the club’s sixth signing of the summer after securing deals with Felix Wiedwald, Mateusz Klich, Hadi Sacko, Pontus Jansson and Madger Gomes.
After spending seven seasons at Ajax he was snapped up by Newcastle in the summer of 2012 and the versatile 28-year-old made 27 Sky Bet Championship appearances last season helping the Magpies secure promotion back to the top flight.
Anita could feature for the Whites for the first time in Saturday’s pre-season friendly with Guiseley at Nethermoor Park.