HeinOnline The HeinOnline platform provides numerous online collections of legal source material, and provides both page-image (as pdf files) copies for retrieval and display of cited works and full-text page images. Use the Comprehensive User's guide to learn about special features such as Scholar Check or retrieving case law from Fastcase by clicking on inline hyperlinks throughout HeinOnline documents. A premiere online database containing more than 200,000 titles, including law reviews and journals, government documents, classic legal treatises, and more.