Watermark PDF

Stamping a watermark on a PDF is a quick way to mark a document as a draft, confidential, or belonging to a specific person or company before sharing it. NeroTool's Watermark PDF tool applies a text stamp to every page in one pass, entirely in your browser.

When this is useful

Watermarking is useful before sending a draft contract for review, distributing sample or preview copies of paid content, marking internal documents as confidential, or labeling scanned copies with a company name. A visible watermark makes the source and status of a document clear at a glance.

How to use NeroTool

1. Open the Watermark PDF tool.
2. Drop your PDF or choose a file.
3. Type the watermark text and pick a position: centered diagonal, tiled across the page, or in a corner.
4. Adjust font size, color, rotation and opacity, then download the watermarked PDF.

Tips for better results

A lower opacity (around 15–30%) keeps the underlying text readable, which matters for full-page documents like contracts or reports. For anti-copy purposes, a tiled watermark that repeats across the page is harder to crop out than a single centered stamp. Keep your original file: the watermark becomes a permanent part of the new PDF and cannot be removed automatically afterward.

Privacy and browser-based processing

NeroTool is built around browser-side processing for its client-side tools. That means the selected file can be handled by your browser rather than being intentionally uploaded to a NeroTool application server. Some tools may still load JavaScript libraries from third-party CDNs. Check the individual tool page and the privacy policy for the exact processing path.