Our script sets one cookie value in order to track whether a visitor is new or returning. A "returning" visitor is one that has previously visited any tracked page on your domain within the last 5 years.

The cookie is named is_returning and has a value of either 0 or 1. It expires 5 years from the date that it was set.

You can prevent Crazy Egg from setting any cookies by setting a Javascript variable namedCE_NO_COOKIES to true somewhere on your tracked pages.