Grsync is a graphical front-end to the venerable rsync command-line folder synchronization tool. Grsync is able to efficiently propagate changes between two copies of a folder by sending only the differences. It can be used both on local folders or over the internet. Grsync provides a user-friendly point-and-click interface to rsync for users that are less fond of using a shell. Sample uses for Grsync suggested on the project website include synchronizing a music collection with a removable drive, backing up personal files to a network drive, or migrating files from an old, small hard drive to a newer, larger one. A Windows executable is available for download from the Grsync website. MacOS users can install Grsync using MacPorts or Homebrew. Linux and BSD users can find Grsync in their package management systems. Grsync is a free software with source code available under the GNU General Public License from the Grsync website.