How to use Watermark PDF
- Choose or drop the PDF.
- Type your watermark and set size, opacity, color and angle.
- Press Add watermark and download the watermarked PDF.
Questions
Can a watermark be removed later?
A text watermark added this way is part of the page content, so casual readers can't switch it off. Someone with PDF editing software could still remove it, so don't rely on it as security.
What opacity works best?
15–25% is readable without hiding the content underneath.
Is my PDF uploaded to a server?
No. The tool runs in your browser and works on your PDF directly on your device. Nothing is sent to us or anyone else, which is why it also keeps working if your connection drops after the page loads.
Last updated 13 November 2026.