FAIR-Checker is a web interface (https://fair-checker.france-bioinformatique.fr) aimed at empowering scientists in their FAIRification process. The “Check” page provides a global assessment and recommendations. The “Inspect” page helps users in improving metadata quality leveraging semantic web standards and technologies. For each evaluated resource, we build a knowledge graph based on embedded RDF triples (microdata, json-ld), as well as external knowledge (public SPARQL endpoints). To evaluate metadata quality, we check that used ontology terms are declared in reference registries. Finally, we take advantage of Bioschemas profiles to automatically generate and evaluate SHACL constraints. Users are informed on missing, required or recommended metadata for specific types of resources.