Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for personalizing landing pages. In one aspect, a method includes generating, by one or more servers belonging to a first domain and for a request, a personalized landing page that includes the personalized landing page data, wherein the landing page belongs to the first domain, and the landing page includes at least one link to a resource of the first party that belongs to the second domain; and providing, by the one or more servers, the personalized landing page to the user device, wherein the personalized landing page, when processed by the user device, generates a personalized landing page environment that belongs to the first domain.