When AnyZip adds files to an archive it compresses the files based on either its default values or user-specified options. Ratio indicates the extent of compression of the file in relation to its original size. Therefore, a 5 MB document, compressed to 3.5 MB will have a compression ration of 30% i.e. (5-3.5) divided by 5. The Ratio field in the AnyZip Main Window is used to indicate compression ratio of the file.