How to use Add Watermark
Choose a PDF, enter watermark text, size and opacity, then run the tool.
What the result contains
The text is drawn across each page; it does not restrict copying or forwarding.
Practical tip
Use a short label and inspect a busy page to ensure underlying content remains readable.
Frequently asked questions
Do I need an account?
No account is needed to run this tool.
Are my files uploaded?
No. Add Watermark to PDF runs in your browser, so your file is processed on your own device and is not uploaded to our server. The page only downloads the free code libraries it needs.
Should I check the downloaded file?
Yes. Open the result and confirm its pages and content before sharing or deleting your original.