Doing this once in a while isn't too inconvenient but if you need to compare online and offline files regularly or compare very large files, this process can quickly become a real pain. When comparing online and offline source code files, the process is typically to download the online file over FTP or SCP using WinSCP and then compare that to a local version of the file using some file comparison tool or eye-balling the two files in a code editor by flipping back and forth. In this article, I will describe how to integrate WinMerge into WinSCP to compare a local version of a file to a remote version. One of the many really cool features of WinSCP is the ability to add custom commands.