All tools
PDF metadata
See the title, author and dates a PDF carries, then save a copy without them.
pdf
Drop a PDF, or paste it
The document is read in this tab, so the file stays with you.
The clean copy is the document written again: every page comes out as it was, the title, the author, the subject, the keywords and the software come out empty, and both dates are pinned to 1970 because a PDF always carries one.