Add CONFIDENTIAL Watermark to PDF

A "CONFIDENTIAL" watermark makes it immediately clear that a document contains sensitive information and should not be distributed without authorization. This tool stamps the word "CONFIDENTIAL" diagonally across every page of your PDF in a semi-transparent style that is clearly visible without obscuring the content.

The watermark text, size, and opacity are all configurable — the default settings are optimized for the common "CONFIDENTIAL" use case, but you can adjust them to match your organization's document standards.

Because the watermarking happens entirely in your browser using pdf-lib, the confidential content in your PDF is never transmitted to any server. This is critical: a tool that uploads your confidential document to a server in order to add a "CONFIDENTIAL" stamp would be counterproductive.

Download the watermarked PDF immediately after processing.