In a world where mobile usage has surpassed desktop, the importance of mobile-friendly websites has become paramount, as highlighted by the significant shift in internet traffic towards mobile devices, with 51.2% viewed on mobile screens according to a 2018 Statista study. The integration of responsive design, which allows websites to adapt across various devices without needing separate codes for each, is critical to maintaining user engagement, as demonstrated by the issues of layout clutter and cross-platform compatibility affecting user experience. Google’s inclusion of mobile-friendliness as a ranking factor since April 2015 has urged developers to prioritize mobile adaptability, leading to a rise in testing tools like Lambdatest, which facilitate real-time testing across multiple devices. Despite these advancements, a study by Canonicalized reveals that one in four websites remains non-mobile friendly, posing a significant risk of losing up to 60% of visitors to competitors. With mobile internet usage expected to grow exponentially, businesses are urged to adopt mobile-friendly designs to retain customer interest and expand into new markets.