PDF
Add a Watermark to PDF
Type your watermark text and set the opacity, and it is overlaid diagonally across each page to protect your document.
Frequently asked questions
Can I control how visible the watermark is?
Yes, you can adjust the opacity so the text appears as a subtle background or a bold overlay.
Is this tool really free?
Yes — completely free, with no sign-up, no ads and no artificial limits.
Are my files kept or shared?
No. Processing happens on our servers, then the file is deleted immediately and an automatic cleanup removes any residue. Nothing is stored or sold.