Add Watermark to PDF Online Free

Add Watermark to PDF Online: Secure Your Designs and Drafts

When sharing drafts, confidential agreements, or design mockups, protecting your work from unauthorized copying or distribution is critical. Adding a watermark to your PDF is a simple way to protect your work. It marks the document as a "Draft", "Confidential", or inserts your company name, branding your documents. Our online tool helps you apply custom text watermarks in seconds.

Playtera applies watermarks locally inside the web browser, protecting your company's intellectual property and drafts.

How to Watermark Your PDF Online

1. Upload Document: Drag and drop your PDF file into the editor.
2. Enter Watermark Text: Input the text you want to display (e.g., "CONFIDENTIAL", "DRAFT").
3. Configure Style: Adjust rotation angle, opacity (transparency), size, and font color.
4. Apply and Save: Click "Add Watermark" to overlay the text and download the branded PDF.

Why Apply Watermarks with Playtera?

• Custom Layout: Set custom rotation, opacity, and sizes to ensure the watermark is placed exactly where you want it.
• 100% Secure: All formatting is done inside the browser, protecting your sensitive drafts.
• Instant Processing: Renders and downloads files in milliseconds without network delay.

Technical Insight: Drawing Watermarks on PDF Viewports

Our watermark tool utilizes pdf-lib's vector rendering features. When you set the watermark parameters, we load the PDF file. For each page, we retrieve the page dimensions and compute the rotation matrix. We execute page.drawText(watermarkText, { x, y, size, font, color, opacity, rotate }). The opacity property is mapped to the PDF's extended graphics state, creating a transparent overlay. The document is saved as a binary stream and downloaded, keeping your data locally protected.