The specific search for is driven by specific user needs. Why the PDF, and not simply "Universalis Online"?
For rigorous French scholarship, the Larousse online encyclopedia offers a similar depth and allows users to generate PDFs of individual entries legally and without cost. encyclopedia universalis pdf
Note: Do not automate this process with bots or scrapers. Attempting to download the entire database (hundreds of thousands of pages) via scripts violates the Terms of Service and can result in a permanent IP ban. The specific search for is driven by specific user needs