Add Watermark to PDF Online: Custom Text & Logo Watermarking

Select or Drop PDF File to Start Using 💧 Watermark PDF

100% Free & Private — Processed entirely inside your web browser without server uploads

About 💧 Watermark PDF

When sharing preliminary business proposals, early research drafts, or internal financial summaries, stamping a prominent label like "CONFIDENTIAL", "DRAFT", or "SAMPLE" is essential. It prevents misunderstandings and discourages unauthorized leaks or distribution.

SmallPDF Pro’s Watermark tool lets you add custom text watermarks across every page of your PDF in seconds. You have full control over the wording, diagonal rotation angle (e.g. standard 45°), font size, color, and transparency opacity.

Because the watermark is embedded directly into the PDF vector layer client-side, it cannot be easily stripped away by taking screenshots or viewing the file in different PDF reader apps.

Step-by-Step Guide: How to Use 💧 Watermark PDF

Key Features & Capabilities

• 🖋️ Custom Text & Presets: Enter any text or choose quick presets like CONFIDENTIAL, DRAFT, SAMPLE, or COPY.
• 📐 Angle & Position Control: Rotate your watermark diagonally across the page or center it horizontally.
• 👁️ Subtle Transparency: Adjust opacity (0.1 to 0.4) so your underlying document text remains perfectly easy to read.
• 🔒 100% In-Browser Privacy: Your confidential documents are watermarked locally without cloud server exposure.

Who Uses This Tool?

Pro Tips & Best Practices

• An opacity setting between 0.15 and 0.25 is ideal: noticeable enough to establish ownership, yet gentle enough not to obstruct reading.
• A 45° diagonal angle across the page center provides the highest visibility across diverse page layouts.

Frequently Asked Questions (FAQ)