What is PDF Metadata?
TL;DR: PDF metadata is hidden information embedded in a PDF file, including the author name, creation date, modification date, software used to create it, title, subject, and keywords. This data is invisible to readers but accessible through document properties.
Metadata can pose privacy risks — it may reveal who created or edited a document, what software was used, and when changes were made. For sensitive documents, metadata should be removed before sharing.