Step 2. In the top toolbar, choose Tools > Edit PDF > Watermark > Add. · Specify the watermark you want to add. · Click Save. Step 3. To access watermarks from any page in your PDF, you can add the option ‒ Watermark button on a page header. When you choose a page with watermark, there will be a button to the right of the page with watermark and “Add Watermark to PDF” link. Using Watermarks in PDF with Adobe PDF Viewer You must use Adobe Reader 10.0 or later for Windows, Macintosh, Linux, and Android on a computer, or Adobe Acrobat X on the Chrome Web Store for a PDF viewer. Steps for adding a watermark: Step 1. Choose Preview App > Watermark menu item from the Adobe Reader X menu bar Step 2. Click Add Watermark button on the toolbar of Adobe Reader X or press F10 and choose To add Watermark. You can add the watermark on any page you wish. You will see watermarks on pages you have opened previously, as well as on pages you have previously closed. Add Watermark to PDF on Mac Step 1. Go to the App Store and download Acrobat Reader for Mac. Step 2. Open Acrobat PDF on Mac. Step 3.