SEARCH DIRECTORY
PDF and document search engines
Find public PDFs, books, research, government records, and files in FTP archives and cloud storage.
For direct Google, Bing, and Yandex queries, see the search operator examples.
PDF and file search
PDF search
PDF.CAB
Search the web for PDF manuals, reports, forms, and papers in one place.
Product manuals
Manuals.plus Deep Search
Look up user guides, setup instructions, and service documents by brand or model.
File formats
FindFiles.net
Look for PDFs, Word documents, spreadsheets, presentations, and other downloadable files.
Books and archives
Digitized collections
Internet Archive
Search for scanned books, manuals, magazines, and historical documents. Available formats vary by item.
Books and periodicals
Google Books
Search by title, author, phrase, or ISBN. Choose Full view only to find books you can read in full.
Ebooks
Project Gutenberg
Search the free ebook catalog by title or author. Many titles are available as EPUB or plain text.
Research and public records
Academic literature
Google Scholar
Search for articles, theses, and citations. Follow a PDF link when an accessible copy is available.
Research preprints
arXiv
Find papers by title, author, subject, or arXiv ID and open their PDFs.
U.S. federal publications
GovInfo
Search government publications, including legislation, congressional reports, and the Federal Register.
Aerospace research
NASA Technical Reports Server
Find NASA reports, conference papers, and technical publications.
Development research
World Bank Documents & Reports
Search World Bank publications, working papers, and project documents.
FTP indexes and public storage
Public FTP search
Mamont FTP Index
Search by filename or browse indexed FTP hosts. Older entries can point to files that have moved.
FTP mirror search
Google search of the FUNET FTP mirror
Run a PDF search scoped to the public FUNET mirror. Add a title or filename to narrow it.
Browse directories
FUNET FTP Archive
Browse the Finnish research network’s archive through its HTTPS mirror, including the RFC collection.
Cloud storage search
GrayhatWarfare Public Buckets
Search filenames in indexed public cloud buckets and filter extensions such as PDF, DOCX, or XLSX.