Add Watermark to PDF

Why Add a Watermark to a PDF?

Adding a watermark to a PDF is the industry-standard visual method utilized to protect intellectual property, clarify document states, and securely brand external communications. By permanently stamping a slightly transparent overlay—such as "CONFIDENTIAL" or "DRAFT"—into the background footprint, you establish ownership.

Primary reasons include:

• Protect Copyright: Deter unauthorized reproduction or digital theft of creative works, contracts, and proposals.
• Brand Documents: Automatically enforce corporate styling by injecting your company logo across client deliverables.
• Clarify Status: Quickly communicate document versions via large diagonal text marks indicating `REVIEW`, `VOID`, or `APPROVED`.

Text vs Logo Watermark in PDF

Deciding whether to apply a Text string or upload an Image logo depends crucially on your organizational intent.

Text Watermarks are incredibly lightweight. They excel at communicating direct action states. If you need to write "DO NOT COPY" diagonally across a financial statement, text logic generates perfect vector sharp lettering that consumes virtually no extra file size footprint.

Image Watermarks (Logos) are crucial for corporate branding. By uploading your transparent `.png` logo and mapping it to the bottom-right corner of your invoices, your PDF carries professional credibility. However, images contain binary pixel data which inherently adds a fraction of file payload size to the finalized download output.

How to Add Diagonal Watermark in PDF

A diagonal watermark stretching widely from corner to corner serves as the most formidable deterrent against manual copying, screenshotting, or optical character scraping.

To achieve the perfect standard diagonal configuration, load the tool and type your phrasing aggressively (e.g., "STRICTLY CONFIDENTIAL"). Select the Center position on the layout grid. Next, locate the Rotation Angle dropdown toggle. Rather than the default horizontal orientation, selectively assign it to Diagonal (45°). Lower the opacity transparency natively to 30%, ensuring the text remains legible without completely blinding the actual critical content underneath your stamp.