WinRAR how to know the file compression size in advance

Want to know how large the file to compress will be after compression? Open the WinRAR window, select the folder or file you want to compress, and then click the Info button on the toolbar, and in the Open window, click the estimate button in the estimate compression function bar, WinRAR will give you the compression rate, Data such as compressed packet size and compression estimate time are useful for compressing larger files or folders. You can also select the Auto start option if you want to automatically evaluate the file each time you click the Info button, winrar.