How to Add a Watermark to a PDF Online for Free
Sharing digital documents can be risky. Whether you are sending a drafted contract to a client, an unreleased script to a producer, or a portfolio to a prospective employer, you want to ensure your work isn't misused. Our Free PDF Watermarker lets you instantly stamp identifying text across every page of your document, acting as a powerful visual deterrent against unauthorized sharing.
Why Our Watermarking Tool is the Safest Option
Think about the documents that usually require watermarking: legal papers, financial disclosures, and intellectual property. Uploading these to a random cloud server to add a "CONFIDENTIAL" stamp defeats the entire purpose of document security.
- Client-Side Processing: Our tool uses local JavaScript to edit your document. Your PDF is loaded directly into your browser's memory, the watermark is mathematically applied, and the file is saved back to your hard drive. It never touches our servers.
- Customizable Transparency: A good watermark should be visible without making the underlying text unreadable. Adjust the opacity slider to find the perfect balance.
- Diagonal Stamping: By rotating the watermark 45 degrees, you cover the maximum surface area of the page, making it incredibly difficult for someone to crop the watermark out.
Quick Steps to Secure Your PDF
- Select Your Document: Drag your PDF into the secure upload area above.
- Type Your Text: Enter words like "DRAFT", "CONFIDENTIAL", "DO NOT COPY", or your company's name.
- Adjust the Settings: Choose a prominent color, set the font size, and pick an angle.
- Stamp and Download: Click the button. The browser will instantly apply the text to all pages and present a download link.