Put a logo, signature, or seal on every page of a PDF, at whatever opacity you want.
Use Image Watermark (interactive) — JavaScript required for uploads.
The first file is the PDF. The second is the image — PNG or JPG.
Runs entirely in your browser — your file is never uploaded. The image is embedded once and drawn on each page, scaled to fit and centred. PNG transparency is preserved.
Yes, completely free and with no account.
No. A watermark is a visible mark, not encryption. It can be removed by anyone with a PDF editor.
Yes — use Watermark PDF for a diagonal text stamp.
This tool works entirely on this page. Your file is opened by JavaScript here, changed in memory, and handed straight back to you — it is never uploaded. Open your browser's Network tab while you use it and you will see nothing leave your device.
Because there is no server doing the work, there is no signup, no watermark, no file size limit, and no daily cap. Nothing is stored, because nothing is received.
Browse all free PDF tools, or read how we handle privacy and security.