1. In order to save space and capacity, some websites use plug-ins to compress the uploaded pictures, making them smaller, which also means that the quality of the pictures decreases, leading to blurred pictures;

2. If there are photos of different sizes on the webpage, the uploaded photos are smaller than those on the webpage, which will be distorted and blurred;

3. The bigger you zoom in, the more blurred the pictures on the web page, because these are all pixel format types. The total number of pixels is the same, so the number of pixels in the same area is also the same. After you zoom in, the number of pixels remains the same, and it is naturally unclear when the area becomes larger. If you want to enlarge and reduce the display effect, you must do it in vector format.

Some of them have their own network cards, which are not fully open.