Abstract: The method comprises several card customization steps and uses a data base formed by files containing customization data. To prevent the recording on a particular card, during one of the steps, of data designed for another card, there is provided a preliminary identification step that consists of the recording, on the card, of an identification element associated with one of the files. At each following steps, the identification element is read on the card so as to gain access to the associated file. Application notably to identity or credit cards.