Watermarks are not secure PDF redaction

Why this happens

A watermark identifies or labels a document. It does not securely remove the content underneath it or prevent copying.

What to try first

Use watermarks for labels such as Draft or a logo. Do not use a watermark or a white overlay as a substitute for verified redaction of sensitive information.

Try it on a fresh copy

1. Open the PDF and enter a short label, such as Draft, or choose an image watermark.
2. Adjust position and opacity in the preview. Keep the document readable beneath the mark.
3. Save a copy and inspect pages with both light and dark backgrounds.

How to tell whether it worked

Check both light and dark page areas; a watermark can disappear against one background or obscure another.