Add "Do Not Copy" Watermark to PDF

Stamp every page of your PDF with a prominent "DO NOT COPY" watermark to deter unauthorized reproduction. This preset applies a red-toned diagonal watermark at 25% opacity with large 52pt text, making the restriction clearly visible while keeping the underlying content fully readable. Essential for proprietary documents, trade secrets, internal training materials, pre-release product specifications, and any content where unauthorized duplication could cause harm. The watermark is permanently embedded into the PDF content stream, so it cannot be removed by simply opening the file in another editor. Whether your document is viewed on screen or printed, the "DO NOT COPY" message is always visible — a strong visual deterrent against unauthorized reproduction.