In the contemporary world, the ability to read fluently is essential for students learning English as a foreign language (EFL). In the era of technological advances digital formats such as e-books and audio books are needed in reading strategies. For this reason, tools are needed for learning English such as the U-Dictionary. This study aims; firstly to describe students' perceptions about using U-dictionary and secondly to explain the advantages and disadvantages of using U-dictionary to enhance reading comprehension skills. This study used qualitative method and descriptive research design. The research participants were six students English Department at UIN Walisongo in the academic year 2024-2025. Data collection technique used interviews and documentation. Data analysis technique applied data reduction, data display and conclusion drawing or verification. The result of the study show that most students use U- dictionary to translate instantly, example sentences, pronunciation and synonyms. In addition, U-dictionary is a good medium to enhance reading comprehension skills because U-dictionary has many diverse features, and it is easy to use and efficient in finding the meaning of words or even paragraphs in reading. In addition, in reading comprehension skills, students have difficulty because of difficulties with long texts, unfamiliar vocabulary, pronunciation and difficult sentence structures. U-dictionary helps overcome difficulties in reading comprehension skills and finding unfamiliar words and pronunciations in reading texts. The advantages are an easy-to-use interface, offline functionality, to practice pronouncing words from vocabulary and various learning tools. Meanwhile, the disadvantages of using U-dictionary; limited free features, advertisements, incomplete offline functionality, over-reliance instant and internet limited access.