With the implementation of GDPR, online display advertising spend will face greater headwinds than other digital ad channels. Marketers, publishers, and adtech firms should read this report to understand how online display ad spend will evolve over the next five years across 25 European countries on PCs, tablets, and smartphones, as well as for banner and video ads. European programmatic ad spend by format is also included. Online display refers to any banner and video advertising outside of social networks. A downloadable forecast model accompanies this report online.