The digital landscape is evolving rapidly, with people spending an average of 7 hours per day on internet-connected screens. For children under five, screen time ranges from 0.9 to 3.5 hours per day, with potential negative effects on health and development. The World Health Organization recommends that children under five should not spend more than one hour per day on digital devices. This study aims to evaluate the effectiveness of behavior-changing techniques on the duration of screen time among preschoolers and the level of satisfaction. Among their parents at a selected school in Kanniyakumari District, Tamil Nadu, India. A quasi-experimental one-group pre-test post-test design was used, involving 60 preschool children and their parents recruited through convenience sampling. This study found the pretest mean screen time score was 32.31 (± 3.63), indicating 2 hours of screen time per day, while the post-test mean score was 23.73 (± 2.82), reflecting 1 hour per day. This demonstrates a significant reduction in screen time among preschoolers following the intervention (P < 0.01). The behavior-changing techniques effectively reduced preschoolers' screen time by approximately 1 hour. Therefore, limiting screen time for young children and actively promoting offline experiences is imperative.