The Indonesia National Single Window (INSW) system is carried out with data governance policies to support the delivery and processing of data, information, and decisions in a single way, as in the research of Sobar, Deni, Riswandi, Hamidi, and Permadi (2021), and Riswanto (2021) to deal with the competition process and granting customs permits by the President’s mandate in Presidential Regulation No. 76 of 2014. This study aims to analyse how small and medium-sized enterprises (SMEs) in Central Java perform against the INSW in international trade. The research method used in this study is qualitative, namely, a research method that provides more analytical and subjective explanations. The results concluded that INSW uses an electronic portal to input documents. The use of electronic portals causes the import-export process to be faster and more efficient. However, the INSW system in its implementation is considered rudimentary because there are often problems in processes such as difficulty accessing the INSW portal or in other electronic service portals integrated with the INSW System. Therefore, intensive assistance and training are needed so that there is synergy in carrying out export activities to destination countries that have collaborated in Free Trade Asia with Indonesia.