Language abilities in the early years are a strong predictor of children's success in school. However, a considerable number of children enter school with poor language skills. Therefore, one of the most important but also challenging mandates of early childhood education and care [ECEC] is to promote these skills before school enrolment. Meta-analytic evidence suggests that shared book reading is a valuable tool to narrow this gap in the early years. In the digital age, e books might offer new opportunities to foster language development in ECEC. This meta-analysis investigates the effectiveness of e-book interventions in comparison to regular childcare and to shared print book reading in classrooms. The systematic search, examining studies from 2000 to 2018, was carried out by two independent reviewers. A random-effect model was used to aggregate findings. Altogether, 17 studies with 30 different e-book treatments were included. Children benefited significantly more from the e-book interventions compared to regular childcare (g = 0.85). Activities with e-books were also ahead of print storybook reading in ECEC (g = 0.45). The effectiveness was mainly moderated by story repetition, number of sessions, and embeddedness in the classroom. E-books were primarily researcher-developed and included congruent functions to foster language development. Implications for practice, research and app development are discussed.