Add Watermark to PDF: Text and Image Watermarks Explained
Add text or image watermarks to PDF pages — behind content, on top, or diagonal. Includes batch watermarking with Python and free online tools.
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Tags: pdf, developer-tools, editing
Add Watermark to PDF: Text and Image Overlay Guide Watermarks serve two distinct purposes: deterrence (the bold "DRAFT" or "CONFIDENTIAL" that signals intent) and attribution (a per-recipient mark that traces leaks back to the source). The technical implementation is the same — overlaying content on PDF pages — but the requirements differ. This guide covers both text and image watermarks using Python pypdf and JavaScript pdf-lib. Understanding PDF Watermarks A watermark is content added on top of or behind existing page content: Foreground watermark: Rendered over the page content. Clearly visible, harder to remove. Background watermark: Rendered behind page content. May be hidden by solid page backgrounds. Diagonal text watermark: The classic "DRAFT" style, rotated 45 degrees across the…
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