You can do the following steps to remove watermarks in your documents:
1. On the reading page, click Editor -> Watermark -> Remove Watermark;
2. In the pop-up window, select the current document and click Apply to remove the watermarks added to it. In the Select Folder dialogue box that appears, select a folder to save the file;
3. If you need to remove watermarks from multiple PDFs, click Add Files + -> select PDFs in the Open dialogue box. Click Apply, and then in the Select Folder dialogue box that appears, specify the folder and filename in your preference.