1. First, open the JPG image that needs to be set in ps.
2. After opening the picture, save the file according to the following path, that is, the file is stored in the format used by the web.
3. Then set the format to JPEG format in the pop-up dialog window.
4. After setting the JPEG format, you can see the size of the picture in the lower left corner, and then reduce the value in the picture quality in the upper right corner until you see that the picture size in the lower left corner meets the requirements, you can change the size of the picture by changing the picture quality.