Chemotion is an an open-source ELN developed by the Karlsruhe Institute of Technology (KIT) in Germany in collaboration with other partners of the National Research Data Infrastructure of chemistry (NFDI4Chem). Chemotion is tailored to the needs of researchers in the field of chemistry, providing features to facilitate data management, experiment documentation, the analysis of measurements and analytical data, and collaboration. Chemotion aims to streamline the research process in chemistry laboratories by offering tools for recording experimental data, for drawing and processing chemical structures, the transformation of proprietary files into open file formats, the management of a chemical inventory, and the organisation of research workflows. As an open-source project, Chemotion allows users to customise and extend its functionality according to their specific requirements. Overall, Chemotion is designed to enhance efficiency, reproducibility, and collaboration in chemistry research through its features tailored to the needs of chemists with an experimental focus. It can be used to seamlessly transfer data into the research data repository Chemotion to publish research data.