This resource addresses the issue of online gender-based violence (OGBV), emphasizing that it stems from deep-rooted gender inequalities and discriminatory social norms. While many forms of OGBV are extensions of traditional gender-based violence, the technological aspect of OGBV makes it more persistent, replicable, and scalable, enabling perpetrators to target women, girls, and other marginalized groups more easily. The toolkit explains various forms of OGBV, provides guidance on how to respond to it, and offers resources for support, including legal avenues, mental health services, and reporting mechanisms. Curated by the KRYSS Network, the toolkit draws on the experiences of feminists and activists defending digital spaces, making it a living resource for combating the growing problem of OGBV.