How Compress Or Zip Your files Online Free

How To Compress Or Zip Your files Online For Free,as nowadays there is no big need to zip or unzip files online as everybody will be using winrar software installed in there pc to zip or unzip your files but sometimes you come into need of doing this online,as it happened with me.As some days ago my pc got effected with viruses and my winrar was not working,then i tried to install it again but