Marketers use various advertising formats to get consumers to notice and remember their ads. When advertising online, advertisers have a wide range of choices regarding ad length/ position and adjacent video content, and these choices differ- entially influence ad effectiveness. In the present study, we found that ad length had a positive effect on ad memorability, where longer ads led to better brand name recognition, consis- tent with the well-known effect of the duration of television commercials (e.g., Pieters and Bijmolt 1997)