How it works
Upload & Edit
Your PDF Document
Your PDF Document
Save, Download,
Print, and Share
Print, and Share
Sign & Make
It Legally Binding
It Legally Binding
What Are Some Free Offline Software Tools That Can Help Redact PDF?
Watermark On Pdf can add watermarks to all or some pages of a PDF file. If you then secure the document with a password to prevent changes, it can't be removed
Watermark PDF: All You Need to Know
On the other hand, if you do nothing and the document doesn't change, the watermark won't appear. The other problem is that watermarks can't be added once a PDF file has been saved. There is an add-on that can convert text documents to PDF's, but this is only for text. Watermarks can't be added.