There are several ways to do this. First, adjust the image size, open the image with ps, and then ctrl+alt+I will reduce the pixels in the image size, but the image will become blurred and there will be more mosaics.

Second, after the picture is opened with ps, it will be saved as ctrl+shift+S, and the jpg format will be selected, and then the image quality will be adjusted, which will also affect the image clarity.

The third is to export to web format (the shortcut key is ctrl+shift+alt+S), as shown below.

Change the format to jpg and save it. In the pop-up dialog box, select the saved path and name. Select Image Only as the format, and then click OK. The picture saved with this is small enough and clear enough, which is a common way of web pages.