Election campaigns in hybrid media systems are characterised by the integration of newer and older media. With the rise of social media platforms, newer tools of political communication emerge, such as online campaign posters, complementing older tools, such as traditional campaign posters. This raises the question whether the newer medium online campaign posters replicates strategies of professionalised political communication (i.e. personalisation, de-ideologisation and negative campaigning), and whether major and minor parties differ in their use of these strategies in online campaign posters. Against this background, we conducted a quantitative content analysis of visual and textual elements of online campaign posters and traditional campaign posters ( N = 1,069) for the 2013 and 2017 German Bundestag elections. The results indicate that online campaign posters are significantly more negative than traditional campaign posters. Moreover, the use of online campaign posters tends to moderate the inter-party competition in the social media environment.