This paper addresses how different store formats moderate the relationship between store image and purchase intention, mediated by brand awareness and perceived value. Questionnaire data was collected through face-to-face interviews with retail customers on the streets of a city in southern Brazil. Hypotheses testing were performed using the partial least squares structural equation modeling, supported by Smart-PLS and the Bootstrapping procedure run in the Process software. The model's sample included 298 retail customers for each store format (supermarket and mini-market). Results showed that store image positively impacted customer purchase intentions and the mediators, perceived value and brand awareness, which had a distinct effect on the direct relation of store image and purchase intention. Store format presented moderation effects on the relation between store image and brand awareness for both store formats: the higher the perception of store image, the greater the consumer's brand awareness. However, store format did not present a moderating effect on the relationship between brand awareness and purchase intention. Store image was found to be an important independent construct that improves brand awareness and increases perceived value. The number of mini-markets in Brazil is increasing, indicating that they are supplying a need unmet by supermarkets. The study design's implementation in the city streets, respondents were requested to imagine store image, which may have affected some of the parameters. The model integrated store image as an important construct influencing purchase behavior and this study presented a mediated-moderated model with managerial implications.