Digital reading platforms have revolutionized the way users interact with textual content, offering accessibility, convenience, and personalization that transcend traditional print media. Central to their success is the role of user experience (UX) and interface design, which significantly influence reader engagement, satisfaction, and retention. This paper explores key aspects of UX and interface design in digital reading platforms, emphasizing their impact on usability, accessibility, and overall reading behaviour. Effective interface designs prioritize intuitive navigation, customizable features, and responsive layouts to accommodate diverse devices and user preferences. Accessibility innovations, such as text-to-speech, font adjustments, and high-contrast modes, ensure inclusivity for individuals with disabilities. Personalization through adaptive algorithms enhances user engagement by offering tailored recommendations and content organization. However, the balance between customization and information overload remains a critical design challenge. Moreover, the cognitive and psychological implications of screen-based reading, including eye strain and reduced comprehension compared to print, underscore the need for thoughtful design choices such as reduced blue light, optimized line spacing, and serif font options. Emerging technologies like augmented reality (AR) and artificial intelligence (AI) further enrich user interactions by providing immersive and context-sensitive reading experiences. This paper also discusses the importance of usability testing and iterative design processes to meet the evolving needs of diverse demographics, including children, older adults, and multilingual users. By synthesizing research and best practices, this study underscores the pivotal role of UX and interface design in shaping the future of digital reading platforms.