Add a text watermark to a PDF online
Stamp every page with custom text such as CONFIDENTIAL, DRAFT, or an author name. Choose the position, text size, and opacity while the PDF stays on your device.
How to add a watermark to a PDF
- Choose one standard PDF file.
- Enter the watermark text and adjust its position, size, and opacity.
- Download a new watermarked PDF without changing the original.
Common uses
Mark internal reports, contract drafts, course handouts, portfolios, proofs, and client previews before sharing them.
Privacy and supported format
Standard .pdf files are processed in the current browser. The PDF is not uploaded or stored, and the original file is never overwritten.
Frequently asked questions
Does it support Chinese and other non-Latin text?
Yes. The browser uses an available system font to render CJK characters, numbers, and common symbols.
Can I change the position and opacity?
Yes. Choose diagonal center, top center, or bottom center, then adjust the size and opacity.
Will the original PDF be overwritten?
No. The tool downloads a separate watermarked copy.