"ich bin alles": A Web-Based Information Portal on Depression and Mental Health in Children and Adolescents Abstract: "ich bin alles" is a digital information portal that provides evidence-based information on depression and mental health in children and adolescents through a website and associated social media channels. The service is aimed at children and adolescents aged 12-18 with and without depression as well as their parents. The aims are 1) to educate about depression and prevention and treatment options, 2) to strengthen mental health and increase help-seeking behaviour, and 3) to destigmatise the disorder. Evidence-based information on the symptoms, diagnosis, causes, and course of depression as well as guideline-based treatment are provided to the target groups, thus fostering specific knowledge and concrete help for early diagnosis and treatment. In addition, children, adolescents, and their parents receive information about prevention options. The website is scientifically evaluated on an ongoing basis. A central aspect in all phases of the project is the active participation of all target groups, who continuously contribute to the development of content, website design, and social-media channels as well as to the evaluation. Information regarding "ich bin alles" is distributed in a variety of ways, including workshops, media, and scientific congresses. This article provides the first comprehensive introduction of the project in a scientific journal and informs about the development of evidence-based digital information tools as well as how to disseminate "ich bin alles" among colleagues and target groups.