How it works

Text or image watermarks — upload a logo PNG/JPG to stamp your brand across pages.
Tiled repeats the watermark across the entire page (much harder to crop out than a single center mark). Diagonal band draws one large angled stamp.
Apply to all pages, just the first page, or a custom list.
Note: a visual watermark is a deterrent, not security — it can be removed by someone determined. For real protection you'd need PDF encryption/permissions, which this tool doesn't do.
A short ad plays before your download starts — it helps keep this tool free. Processing itself happens instantly; the ad is just a brief pause before the file downloads.
All processing happens locally in your browser using pdf-lib — your files are never uploaded anywhere.