Founded over a century ago as a legal publishing company, William S. Hein & Co., Inc. is now a third-generation family business, internationally recognized primarily through its flagship product, HeinOnline. Launched in 2000, HeinOnline is a premier online research platform offering unparalleled access to nearly 250 million pages of authoritative multidisciplinary resources, including scholarly journals, government documents, international treaties, case law, and rare historical documents. Known for its commitment to authenticity, HeinOnline exclusively provides fully searchable, image-based PDFs of original publications.

HeinOnline's exceptional breadth and precision have earned widespread acclaim, consistently placing it among the top subscription databases globally. It serves a diverse audience of academic institutions, law firms, research institutes, governments, and public libraries, enhancing scholarly and professional work across 1,500 subject areas such as criminal justice, political science, history, and business. Recognized repeatedly by prestigious international library associations for excellence and innovation, HeinOnline remains a trusted and indispensable resource within the global research community.