This article provides a guide on how to convert files to RAR format in Windows 11/10. While Microsoft has announced that Windows 11 will soon support RAR files and other archive formats, users will need to use a free tool to convert files to RAR format. RAR files are becoming increasingly popular for online data compression, but Windows does not currently support them natively. However, third-party tools can be used to open RAR files on a Windows 11/10 PC. Once the new feature is rolled out, users will be able to extract RAR files through the Windows 11 OS, but not compress them. This article outlines two methods for converting files to RAR format: using WinRAR and using free online file converters. The article provides step-by-step instructions for each method and recommends three online file conversion tools for users to choose from. Finally, the article answers common questions about creating RAR files in Windows 11 and the upcoming support for RAR files in the operating system.