Remove hidden metadata from a PDF

The document information dictionary (title, author, subject, keywords, creator, producer, creation and modification dates and any custom entries such as a company name); every XMP metadata stream except those of pictures, fonts and attachments: the document's, each page's and those of other parts such as graphics, annotations, the form, bookmarks, page thumbnails or colour profiles; the document identifier pair; application-private PieceInfo data and LastModified dates, wherever they are; the author and dates of comment and markup annotations; and, whatever you tick, objects nothing in the file uses, such as the older copies an incremental update leaves inside a file, since the cleaned file is written anew. The page lists each of these before you clean, and checks the cleaned file for them again. Comment text, form field values, the targets of links and bookmarks, and the page content stay as they are.

No. Many tools stamp their own producer name and a new modification date when they save. This one saves without adding anything, so a fully cleaned file carries no document information at all; the page checks the result after saving and tells you what is left.

Anything that is content rather than metadata: text and images on the pages (including a visible name in a header), embedded files (attachments, which are counted and kept), and the metadata of pictures, fonts and attachments themselves: a photo's EXIF, the names inside a font, and the XMP stream that describes a picture, a font or an attachment. The page names the EXIF and XMP it finds there, before and after cleaning. Text hidden under redaction boxes is content too; use a redaction tool for that. Password-protected PDFs cannot be opened here.

Yes, tick "but keep the title". Everything else in the information dictionary is still removed.

No. The page loads a small script into your browser and every operation runs on your device. You can check this yourself in the browser's network panel: after the page has loaded there are no upload requests. Closing the tab discards the file.

No. These basic tools are free, have no limits set by us and store nothing on our servers. The practical limit is your device's memory for very large files.

Nothing you open or type. While the tab is open, the tool pages keep a short list of the steps taken in it, in the tab's session storage: the step (page opened, started, succeeded, first success, used again or failed), the tool's name, the time, how many files were used and, for a failure, an error code; never a file name, the contents of a file or your text. It holds at most the latest 200 steps, and the browser deletes it when the tab closes. The page never sends it. Where a Report a problem button is shown, you can attach the last 20 steps to your report; nothing is attached unless you tick that box. In local storage the page keeps only choices you made: a Light or Dark theme until you choose System again, the language you picked with the EN / 中文 switch if it differs from your browser's language, and this tool in your recently used list if you switched that list on at the tools page.