Athletes compete in weight categories and are divided into two groups within these categories. Competition is on a knockout system that eventually determines the two finalists who compete in the gold medal match.
In each event, the four defeated quarter-finalists compete in two repechage contests. The winners then compete against the two defeated semi-finalists to determine the winners of the two bronze medals.
In the event of a tie, the contest enters a golden score period of three minutes, when the first score wins.
Find out more information about the Judo competitions at the Olympic Games on the International Olympic Committee website.