Preview the real output
Check placement before downloading
The preview and final download use the same processing function, so position, rotation, opacity, and repeated patterns can be checked in advance.
No install. No upload.
Add a watermark to PDFs
without giving up privacy.
Place text, logos, stamps, or signatures with the position and transparency you choose, then preview the actual result.
β No server uploadsβ No external APIβ Browser-only processing
PDF tool
Watermark PDF
Choose a PDF to watermark
Select one PDF to open text and image watermark settings.
π Your PDF and watermark image never leave this device.
Frequently asked questions about PDF watermarks
Can I use Korean text?
Yes. The tool embeds only the needed characters from the included open-source Korean font.
Can I use a transparent PNG?
Yes. Transparent PNGs and regular PNG or JPG images are supported.
Is my file sent to a server?
No. The PDF, image, settings, and result stay inside your browser.