With climate change and the depletion of natural resources posing serious challenges, sustainable branding is becoming a key aspect of modern marketing. This article explores how digital tools, particularly social media, are promoting green brands and increasing sustainability awareness among consumers. With growing interest in environmental issues, consumers increasingly prefer brands that are responsible for nature and expect transparency and commitment to sustainability. The aim of this paper is to analyze how smart social media strategies, such as personalized content and user-generated content (UGC), contribute to building a strong eco-brand. Through case studies of brands such as Allbirds and Natura, it is shown how these strategies help shape consumers’ eco-values and create strong relationships between the brand and its community. The article also highlights the importance of transparent communication to increase trust and support consumers’ green decision-making. Finally, it analyzes the challenges and opportunities that digital tools bring to brands in building sustainable branding and their ability to influence consumer behavior in the digital era.