<![CDATA[This article examines how major Muslim organizations in Indonesia rearticulate Islamic authority through mediatized da‘wah in platform society. While studies of digital Islam have often focused on individual preachers, religious influencers, or online piety, less attention has been paid to Muslim organizations as institutional communicators that must translate historical legitimacy into platform-specific visibility without losing doctrinal credibility. Drawing on a qualitative comparative study of Nahdlatul Ulama and Muhammadiyah, this article analyzes publicly accessible digital surfaces, including official websites, Instagram accounts, YouTube channels, and linked digital services. The study is based on digital observation of recent visible content and platform interfaces, supported by thematic coding of institutional identity markers, communicative formats, thematic distribution, cross-platform linkages, audience-facing indicators, and ecosystem-building practices.The findings show that NU and Muhammadiyah do not merely move da‘wah from offline institutions to online media. Instead, they mediatize organizational authority through three interrelated strategies. First, both organizations construct integrated digital ecosystems that connect websites, social media, video platforms, and auxiliary services. Second, they differentiate communicative functions across platforms: websites sustain textual depth and institutional framing; Instagram condenses messages into visual and affective forms; YouTube enables extended explanation, lectures, podcasts, and live dissemination; while linked services strengthen continuity and user retention. Third, platform adaptation produces a form of hybridized institutional authority in which Islamic legitimacy is sustained through the interaction of organizational credibility, platform affordances, editorial routines, and audience-facing visibility.The article contributes to digital religion, Islamic communication, and organizational communication studies by shifting the analytical focus from individual digital preachers to Muslim organizations as strategic actors in public Islam. It argues that platform culture does not replace institutional religious authority, but reorganizes the conditions under which such authority becomes visible, credible, and socially accessible. In the Indonesian context as a Global South Muslim-majority society, this process also has broader implications for credible religious knowledge, inclusive digital public life, and the sociocultural transformation of Islamic authority.]]>
