Watermark PDF
PDF toolNewStamp a diagonal text watermark across every PDF page.
This tool runs entirely in your browser. Your files never leave your device — nothing is uploaded.
Upload a PDF
Drop a PDF hereYour PDF stays on your device.Browse files
Watermark
Add watermark
Add a PDF and watermark text to apply your overlay.
Frequently asked questions
Does watermarking upload my PDF?
No. The watermark is applied locally with pdf-lib.
Can I change the watermark text?
Yes — set any text, plus its size and opacity.