Přidejte vodní značku do PDF online - bezpečné a okamžité

Upload your PDF, type your watermark text (e.g., CONFIDENTIAL, DRAFT), adjust size, opacity, color, rotation, and position, then click process.

Font size (12-120pt), opacity (5-50%), rotation (horizontal, diagonal both ways, vertical), color (gray, red, blue, black), and position (center or any corner).

Yes, the watermark appears on all pages of the PDF. There is no option to watermark specific pages only — use Split PDF first if you need selective watermarking.

Text watermarks are embedded in the PDF but can be removed with PDF editors. For stronger protection, use lower opacity (harder to isolate) and combine with PDF password protection.

Yes, completely local via pdf-lib. Your PDF never leaves your device or gets uploaded to any server.

Currently text-only. Image/logo watermark support is planned. For now, use our PDF Editor to manually place images on pages.

10-20% for background watermarks that do not interfere with reading. 30-50% for clearly visible stamps like DRAFT or DO NOT COPY.

Up to 100MB per PDF. Watermarking adds minimal file size since it is just text overlay.

Yes. The watermark is added as a text layer on top of the scanned content, appearing over the image.

No, unlock the PDF first with our Unlock PDF tool, then add your watermark.