Quick answer
- Most PDFs carry a title, an author, the apps that made them and a few dates. Much of it is filled in for you.
- It's stored in two places, so blanking a field in your viewer can leave a copy behind.
- Remove Metadata clears the author, software, dates and the second copy in one go.
Where does a PDF keep its metadata?
In two places. They often hold the same details, but nothing forces them to match.
- The document info list: the title, author, subject, keywords, the apps that made the file and its dates. Most viewers show this under Properties.
- A second copy in XML: it's called XMP, and files have been able to carry it since PDF 1.4. PDF/A and PDF 2.0 files must have it.
- Why it matters: a viewer that only reads one of them can show you half the picture.
What else travels with a PDF?
More than the Properties panel shows. All of these go wherever the file goes.
- Attachments and scripts: attached files, form entries, JavaScript and actions don't show on the page.
- Hidden layers: notes, an old draft of a diagram or a watermark can sit in a layer that's switched off.
- Photo data: a photo placed on a page usually keeps its EXIF data, which can include the GPS location from a phone.
- Earlier versions: some editors add changes to the end of the file, so an older version can stay inside.
Has hidden document data caused real trouble?
Yes, and researchers keep finding more of it. A 2026 study and a well-known 2003 case show how much a file can give away.
- April 2026: researchers at RWTH Aachen University checked the source files of 2.7 million papers posted to arXiv, a free public archive of research.
- What they found: usernames, software versions and location data inside images and PDFs, and 82 papers that gave away passwords or private keys.
- February 2003: the UK government posted a Word file about Iraq's intelligence services. Its hidden revision history named the press officers who edited it.
- The fallout: academics also found that large parts were copied from a student's thesis, and the row reached Parliament.
- For PDFs: they hold less history than Word files, but author fields, app names and old saves can still say too much.
How does metadata get into a PDF?
Mostly without you typing anything. Apps fill it in along the way.
- Saving from Word: its PDF export has a "Document properties" option that's on by default. It copies the title and author into the PDF.
- Scanners and PDF apps: they often stamp their own name and version into the file.
- Your setup name: office apps fill in the author from the name you typed when you set them up.
How do I clear PDF metadata properly?
Use a tool that rewrites the file. Blanking fields in a viewer can leave the XML copy, attachments and old saves behind.
- Clear it all: Remove Metadata removes the author, software, dates and the XMP copy together.
- Keep what's useful: View / Edit Metadata lets you keep a proper title and change or clear the rest.
- Remove hidden extras: PDF Sanitizer finds attached files, scripts and hidden layers, then saves a clean copy.
- Don't forget the page: metadata isn't redaction. To delete a name in the text itself, use Redact PDF.
Try the tools
Try it on your own file. The tools are free and you don't need an account.
Common questions
If I clear the Author field in my viewer, is it gone?
Not always. Many viewers only show the first list of fields, so the name can still be in the XML copy or in an earlier save.
Does saving a Word file as PDF remove its metadata?
No, it usually copies it over. Turn off "Document properties" in Word's PDF options, or clear the properties before you save.
Does printing to PDF remove metadata?
Mostly, but not all of it. Print to PDF makes a brand new file, so old saves and the XML copy don't come along. Your computer can still fill in the author and the printer's name, so check the properties afterwards.
Can a PDF show where I took a photo?
The PDF's own fields won't. But a photo placed on a page usually keeps its EXIF data, and that can include the GPS location.
Is it ever a bad idea to remove all metadata?
It can remove a clear title that helps people find and recognize the file. If some fields are worth keeping, edit them instead of wiping everything.
This post is general information about working with PDFs, not legal or security advice. Check anything important with someone qualified. Posts are written with AI help, based on how our tools actually work. About VelloDoc