Citations Checker is a browser-based citation checking and reference management service for students, researchers, writers, publishers, and other professionals. Users can check individual citations, verify reference lists in batches, and audit PDF, DOCX, BibTeX, or RIS documents. It identifies missing reference details, duplicate entries, inconsistent styles, retracted or unreachable sources, and validates DOIs, ISBNs, and URLs. Users can review suggested repairs, generate citations in more than 100 styles, including APA, MLA, Chicago, Harvard, and IEEE, and revisit saved checks and generated citations in a searchable workspace. Results and bibliographies can be exported in supported formats. Paid plans add larger monthly credit allowances, Google Scholar access, and API features at eligible tiers. The service supports academic and other research-based writing workflows that require users to review, organize, and format references.