How to remove metadata from a PDF before sharing

You redacted the visible text, but the file can still give you away. PDF metadata records who made the document, when, with what software, and sometimes far more.

What metadata a PDF carries

• Document properties: title, author, subject, keywords, creation and modification dates.
• Producer and creator: the application and version used, which can reveal your name or organisation.
• Hidden data: form field values, comments, annotations, layers and older revisions.
• Attachments: other files embedded inside the PDF.

None of this shows on the page, yet it travels with the file wherever it goes.

Why it matters

A carefully redacted document can still leak the author's name through the "Author" field, a client's identity through a filename stored in metadata, or an earlier draft through revision data. If you share documents outside your organisation, stripping metadata should be part of every export, not an afterthought.

How to strip PDF metadata

1. Remove the visible sensitive text first with real redaction (see how to redact a PDF so text can't be recovered).
2. Clear the document properties (title, author, subject, keywords).
3. Flatten form fields and annotations so their values aren't stored separately.
4. Remove embedded attachments.
5. Re-open and check. View the document properties of the exported file and confirm the fields are empty.

How Anonyma handles it

When Anonyma exports a clean copy, it removes the underlying text you chose to redact and scrubs the document metadata in the same step, so the shared file doesn't carry the author, history or hidden properties of the original. Everything happens on your computer, and your original file is left exactly as it was.

As always, redaction and metadata removal reduce risk but don't replace a final review: open the exported file and confirm it's clean before you send it.