Small tools. No accounts. Nothing leaves your browser.
i Open a document to see what it is carrying that you cannot see: authors, the software and dates it was made, revision history, tracked changes. Nothing is uploaded.
People attach files all day without ever looking inside them. A PDF names the software and the operating system that made it, and stamps itself with a timezone. A Word document keeps who last saved it, how long it was worked on, usually the company name, and, routinely, tracked changes and comments that were never accepted or deleted, only hidden from view.
This takes out the metadata: the author, the software, the timestamps and, in a Word file, the tracked changes (accepted) and the comments (removed). It leaves the page content exactly as it is. Text hidden under a box is content the author placed, not metadata, so a bad redaction is left for a redaction tool to fix; the file is re-checked the moment you open the copy.
The parts of a document you do not see until somebody else does.
Drawing a black rectangle over a name does not remove it. Setting text to white on a white page does not remove it. Putting a picture on top of it does not remove it. In all three cases the words are still in the file, and they come straight out of a copy-paste. Governments, law firms and newspapers have been publishing documents like this for twenty years.
So this renders every page and, for each piece of text the file will hand over, asks a simple question: can you actually see it? Text that is present but invisible is text somebody believed they had removed. That catches all three tricks at once, without needing to know which one was used.
Reading the metadata back is half the tool. Taking it out is the other half.
Once a file is open, it also writes you a clean copy: the same document with the metadata gone. For a PDF that is the author, the software, the timestamps, the XMP block and the reviewer names on any mark-up. For a Word file it is the document properties, and it accepts every tracked change and deletes every comment, so the copy holds the final text and nothing about who wrote it or what they argued over on the way there.
It does not touch the page itself. Text hidden under a black box is content the author placed, and only they know what was meant to go, so a bad redaction is left for the PDF editor rather than guessed at here. Open the clean copy back into this tab to watch the findings disappear.