The development of communication technologies along with the acceleration of globalisation provide important opportunities for expansion for global businesses. Indeed, multilingual web content is of great value for international businesses. This need of multilingualism to reach global markets gave rise to new translation-mediated practices, such as web localisation. This analysis focuses on 20 homepages of three German car brands: Mercedes-Benz, BMW and Audi. The aim of this study is to assess their compliance to some localisation conventions and usability standards using an heuristic evaluation method and tool. This paper provides an accurate analysis of the homepages, making a comparison between the car brands and their international, Swiss and Italian websites. Results show that there is not much difference in the compliance level between car brands. However, there is a difference between the type of website, with the Italian monolingual homepages obtaining better results than the multilingual ones (international and Swiss).