A PDF holds document information fields most people never look at: title, author, subject, keywords, and the names of the programs that produced it. Editors and scanner software fill these in without asking, so a file can name its author even when the pages do not. This clears all six fields and reports which ones actually held something.
The PDF engine (about 500 KB) loads only when you drop a file in, so the page itself stays light. Your file is read on your own machine and never sent anywhere — open your browser's network tab and watch while you use it.
Six: title, author, subject, keywords, creator and producer — the document information fields a reader shows under file properties. The summary lists which of them actually held a value in your file, so you can see what was there before it was cleared.
No. This clears the labels on the file, not the content inside it. A name typed on a page, sitting in a header, or captured in a scan stays exactly where it is — removing that means editing the pages, which is a different job.
No. These are the document information fields, which is what nearly every reader displays. A PDF can also carry a separate XMP metadata stream, and this tool does not rewrite that stream — so treat it as clearing the visible fields, not as scrubbing the whole file.
The summary says that nothing was set in the first place, rather than pretending to have cleaned something. You still get a file back with all six fields written blank, so you can pass it on knowing they are empty instead of assuming.
These all work the same way — in your browser. Most are free; the ones marked as needing a plan are not.