PDF Watermark is a free Android application developed by raincontinues that allows you to add a watermark image to your PDF files in just a few seconds. With this app, you can add a watermark image to any page of your PDF file in a simple and straightforward way. Unlike online services, this app works offline, and you won't have to worry about your PDF file being uploaded to a website.

To use this app, you need to select the PDF file you want to watermark and then choose the image you want to add as a watermark. Once you have selected both files, just tap the "Add Watermark" button, and the app will perform the operation. The watermarked PDF file will be ready in no time, and you can preview it immediately.

This app is only 5MB in size and will automatically rename the watermarked file. It's free to use forever, and you won't be charged for anything. With PDF Watermark, you can add a watermark to your PDF files quickly and easily without any hassle.