XCMS Online is a web-based platform designed to process untargeted metabolomic data, addressing the growing interest in this field among scientists. The platform, built on the widely used XCMS software, offers an intuitive graphical interface that does not require installation or technical expertise. It supports the entire untargeted metabolomic workflow, including feature detection, retention time correction, alignment, annotation, statistical analysis, and data visualization. Users can upload data files in various formats, select parameter sets, and interpret results through interactive tables and plots. The platform provides detailed information for each feature, including statistics, extracted ion chromatograms, spectrum details, and METLIN assignments. XCMS Online aims to make untargeted metabolomics more accessible to a broader scientific community by eliminating the need for advanced bioinformatics skills.XCMS Online is a web-based platform designed to process untargeted metabolomic data, addressing the growing interest in this field among scientists. The platform, built on the widely used XCMS software, offers an intuitive graphical interface that does not require installation or technical expertise. It supports the entire untargeted metabolomic workflow, including feature detection, retention time correction, alignment, annotation, statistical analysis, and data visualization. Users can upload data files in various formats, select parameter sets, and interpret results through interactive tables and plots. The platform provides detailed information for each feature, including statistics, extracted ion chromatograms, spectrum details, and METLIN assignments. XCMS Online aims to make untargeted metabolomics more accessible to a broader scientific community by eliminating the need for advanced bioinformatics skills.