Abstract This research proposes a scale to measure the credibility of consumer-generated media (CGM). Two studies were carried out: first, a qualitative study based on eleven in-depth interviews with experts in tourism decisions; and second, we ran a quantitative analysis on a sample of 300 frequent users of tourism CGM platforms. The resulting scale, which consists of 4 dimensions and 12 items, is used to measure the credibility of information published in the tourism CGM platforms. The scale was tested for its dimensionality, reliability, and validity; and the results corroborate its accuracy and value as a source of information for travel decision-making. Finally, future lines of research are presented.