Nowadays, whether it is a mobile phone or a camera, the resolution of the photos taken is getting higher and higher, and the picture files are getting bigger and bigger. They not only take up a lot of disk space for local storage, but also consume a lot of time and bandwidth during the process of transferring and uploading to the website. As a result, we generally need to use tools to compress image files.

The advantages of image compression technology include: reduce the disk space needed for images storage, reduce the cost spent on Internet bandwidth and time when you upload images to all kinds of network drives/image hosts, and reduce the time cost on loading images to the web page and downloading them by the users browsing them. There are two grounds determining whether an image compressing software is good or not: compression ratio and the quality of compressed images.

Undoubtedly, PNG is the most popular image format in the present network environment, with the characteristics of high fidelity and transparent support, and thus inevitably it has a bigger file size. But as a nondestructive image format, it is more difficult if you want to reduce its file volume without loss in image quality.