SRCE develops, maintains and promotes national solution for publishing of Open Access journals named Portal of Croatian scientific and professional journals HRČAK. Beside the role of the central portal that provides open access to scientific and professional journals (mostly diamond) of all disciplines this service also provides technical support to journal editors and promotes good practices in scientific publishing (e.g., open and machine-readable format JATS XML, usage of ORCID identifiers, publishing associated datasets and linking papers to them). In 2023 HRČAK provided access to 530+ journals with 283.00+ OA papers. Plan S strongly recommends „Availability for download of full text for all publications (including supplementary text and data) in a machine-readable community standard format such as JATS XML“ (Plan S: Part III: Technical Guidance and Requirements: https://www.coalition-s.org/technical-guidance_and_requirements/). Motivated by Plan S, SRCE has developed a technical support for automatic conversion of articles to JATS XML format that makes articles machine readable, easier for preservation, easier for content and reference mining, more searchable, etc. The service for automatic conversion to JATS XML will be provided through EOSC Marketplace so that European journal editors could use it for their journals. It is expected that availability of services for automatic conversion will encourage publishing in the JATS XML format because it significantly reduces the amount of time and resources required for its creation.