
Many file formats, such as JPEG, MP3, MP4, Docx, and other media files are already compressed files.Furthermore, not all file types can be easily compressed.

However, you cannot always compress a file to the exact size you want, and there is a limit to how much a file can be compressed. This can make the compressed file larger or smaller. So, one might compress it into a smaller file size than another." Most file compression programs allow you to select the level of compression when creating a compressed file. Tech Specialist Luigi Oppido explains, that most file compression programs "will give you the file sizes.

No, but you can select the level of compression.
