Compress, Encrypt, Package and Backup with only one utility With over 500 million users worldwide, WinRAR is the world’s most popular compression tool! There is no better way to compress files for efficient and secure file transfer. Providing fast email transmission and well-organized data storage options, WinRAR also offers solutions for users working in all industries and sectors. WinRAR is a powerful archiver extractor tool, and can open all popular file formats.