PDF Watermark
PDF Watermark Tool
Stamp a text label (like "CONFIDENTIAL" or "DRAFT") or a logo image across every page of a PDF. Control opacity, rotation, and position, all processed locally in your browser.
- Text or Image: Stamp custom text or an uploaded logo/image
- Customizable: Adjust opacity, rotation, size, and position
- Private: Your document never leaves your device
Why watermark PDFs with Karvics?
Watermarking is usually applied to drafts and confidential material specifically because you don't want it circulating without attribution — which makes uploading that same file to a third-party server to add the watermark somewhat self-defeating. Karvics draws the watermark directly onto every page in-browser and shows a live preview before you download, so you can see exactly how it will look without ever sending the document anywhere.
Watermark controls
Watermark controls
- Live preview: See the watermark rendered on page 1 before downloading
- 7 anchor positions: Center plus all four corners and top/bottom-center
- Rotation: Angle a centered watermark from 0-360 degrees
- Opacity control: Blend the watermark subtly or make it bold
- Applies to every page: One pass stamps the entire document, not just page 1
How to Use
- Upload your PDF file
- Choose text or image watermark
- Adjust opacity, rotation, and position
- Click "Apply & Download"
💡 Pro Tips
- Rotation is only available for the Center position — for corner or edge placements, a horizontal watermark reads more cleanly.
- Lower opacity (around 15-30%) keeps a watermark visible without obscuring the underlying text.
Glossary
- Watermark
- A visible overlay (text or image) stamped across document pages, commonly used to mark drafts or assert ownership.
- Opacity
- How transparent the watermark is — lower values let more of the underlying page content show through.
- Anchor Position
- The fixed point on the page (e.g. center, top-left, bottom-right) that a watermark is placed relative to.
- Baseline
- The invisible line text sits on — the reference point PDF rendering engines use to position each line of text on a page.