We use powerful PDF in our daily life nearly every day.In our daily work, we may have encountered large PDF files. It not only affects the transmission speed but also takes up too much space. Using the compression feature of WPS Premium can quickly help you to solve this problem.Take this file as an example.1. Click the Tools tab.2. Then click Compress.3. Now a dialog box will pop up. Here, we can choose the compression level. This will determine the image quality of the compressed fil....