The article is devoted to a problem of information transparency of credit institutions, which plays a key role in ensuring an effective interaction of such institutions with their stakeholders and is considered as one of the factors of their competitiveness and investment attractiveness. Credit organizations are the main players on the services' market. Therefore, it is necessary to provide complete and most transparent information about the activities of a credit institution, in order to receive a high level of trust from both - clients and investors. This article contains an analysis of the stages of development of international regulatory rules in the specified subject area, which allowed to determine and structurize the information to be disclosed by banks and other credit organizations in accordance with the requirements of international financial institutions. The research methodology was based on the main international regulations issued by the Basel Committee on Banking Supervision and governing the activities of credit organizations. During the research it was concluded that it is reasonable to use the XBRL technology adaptation algorithm developed by the authors as a tool to increase the transparency of credit institutions. The result of the study was the development of this algorithm. A study conducted by the authors revealed that, in the development of the developed concept, its provisions on the development of accounting and analytical tools to ensure information transparency of credit institutions, as well as improving the control system for the reliability of data generated, provided and published by credit organizations, are specified.