Do my files get uploaded?

No. Watermarking runs entirely in your browser with pdf-lib.

What image formats work?

PNG and JPG. PNG with transparency gives the cleanest watermark.

Yes — every page gets the same watermark at the chosen position, size, and opacity.

Watermark PDF

Add a text or image watermark with adjustable size, opacity, and position — with a live preview before you export.

Drop a PDF here, or click to browse

Drag, resize and rotate the watermark right on the page

Files never leave your device.

Lightning fast

Privacy guaranteed

Lossless quality

Files never uploaded

Processed entirely in your browser.

No retention

Nothing stored — nothing to delete.

Private by design

No accounts required, no tracking of your files.

Preserves text, fonts, and vector graphics — no quality loss.

Drag, drop, and download from desktop or mobile. No installs, no plugins.

Everything runs locally in your browser. Your files never leave your device.