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Every PDF can carry hidden details such as a title, the author's name, a subject and keywords. They appear in the browser tab, in search results and in the file's properties, and sometimes show a name you did not want to share.
Choose a PDF and the current details are filled in for you. Change them, or empty a box to remove that entry, then save. Everything happens in your browser; the file is never uploaded.
No. Only the stored details change; every page stays exactly the same.
Many browsers and search engines show the PDF's stored title instead of its file name, so a clear title makes your document look professional when shared.