In this article, we discuss the main arguments related to female Muslim converts' formation of a religious subjectivity in the context of studying Islam in online spaces. In distinguishing between Western and Eastern Europe, it is our purpose to highlight the significance of online sources for converts who inhabit geographic “peripheries” of Islam. After giving an overview of the literature that discusses Muslim subject formation among converts, we analyse 35 in‐depth, qualitative interviews with Polish female converts to Islam in reference to a theoretical framework that integrates Belenky et al.'s model of epistemological categories of knowledge and the concept of Muslim subjectivity formation. We argue that for the Polish female converts we interviewed, the process of acquiring and revising their knowledge about Islam, through online engagement with individuals, groups, texts, and multimedia content, is vital for developing an ontologically secure Muslim subjectivity.