PDF Watermark Tool — Add Text Watermarks
Add custom text watermarks to any PDF file directly in your browser. Customize the watermark text, font size, color, opacity, rotation angle, and position. Download the watermarked PDF instantly. 100% private — your files never leave your device.
How to Add a Watermark to PDF
Select your PDF file, type your watermark text (e.g., "CONFIDENTIAL", "DRAFT", "SAMPLE"), choose the font size, opacity, color, angle, and position. Click "Add Watermark" and the tool applies the watermark to every page of your PDF. The watermarked file downloads automatically. Everything happens in your browser using pdf-lib.js — your PDF is never uploaded to any server.
Why Watermark Your PDF Documents
Watermarks protect your documents from unauthorized use and distribution. Mark draft documents as "DRAFT" to prevent premature sharing. Label confidential contracts and reports. Add "SAMPLE" to preview documents. Watermarks make it clear that a document has restrictions or is not the final version, reducing liability and miscommunication.
Privacy-First PDF Watermarking
Most online PDF watermark tools upload your files to their servers, exposing sensitive documents to third parties. This tool is different — pdf-lib.js runs entirely in your browser. Your PDF is read into memory, the watermark is applied using JavaScript, and the result is downloaded directly. Zero network requests are made with your file data.
Watermark Text Ideas for Different Use Cases
Legal: CONFIDENTIAL, PRIVILEGED, DO NOT COPY. Business: DRAFT, INTERNAL USE ONLY, FOR REVIEW. Education: SAMPLE, PREVIEW, STUDENT COPY. Photography: Your name or studio name as a watermark on PDF portfolios. This tool supports any custom text with full control over appearance.