Upload a PDF to view and edit its metadata — title, author, subject, keywords, creator, and producer. Download the updated PDF. No upload to any server.
No. Only the PDF's document information dictionary is updated. Page content, images, fonts and layout are not touched.
It controls how the document shows up in search results, file browsers, document management systems and accessibility readers — and it can be required for legal/archival filings.
No. pdf-lib runs entirely in your browser — nothing is sent to a server.