The paper steps including the topic of digital transformation in maritime transport. Maritime transport is a vital sector worldwide and also one of the European Union's priority sectors. The digitalization in maritime transport is one of the important issues for international maritime organizations to achieve the goals of Maritime 4.0. The research methods are applied legal analyses of documents and comparative method. The article examines the reasons and the need for digital data exchange, as well as the benefits of digitalization in maritime transport. Specially attention is paid to the documents on the European level such as EU regulation 123/9 and EU directive 2010/65; and Union’s collaboration between DG MOVE and DG TAXUD reasons to establishing of Single Window for customs and also defined the meaning of the WTO and IMO – Facilitation and Convention main goal of a paperless transfer of information for the development of Single Windows.