The rapid expansion of internet accessibility and smartphone usage has significantly transformed consumer purchasing patterns worldwide. Online shopping platforms have emerged as dominant retail channels due to their convenience, competitive pricing, wider product variety, digital payment integration, and doorstep delivery services. However, online purchase decisions are influenced by a combination of psychological, technological, economic, and social factors. This study aims to analyze the key determinants that influence consumer decision-making in online shopping environments. Primary data was collected through a structured questionnaire distributed to 150 respondents from different demographic backgrounds. Secondary data was gathered from peer-reviewed journals, e-commerce industry reports, and scholarly publications from 2021–2025. Statistical tools such as percentage analysis, mean score analysis, and correlation analysis were used to interpret the data. The study identified trust and security, product reviews and ratings, price perception, website usability, brand reputation, and social media influence as the most significant factors affecting purchase decisions. The findings reveal that trust-building mechanisms and authentic customer feedback strongly impact buying intentions. Furthermore, digital marketing strategies and personalized recommendations significantly enhance customer engagement and impulse purchases. The study concludes that e-commerce businesses must focus on enhancing digital trust, improving user experience, and adopting advanced analytics to sustain competitive advantage. This research contributes to understanding contemporary online consumer behavior and provides strategic insights for marketers and digital retailers.