CROPFROG is a Chrome add-on developed by PIKOPAPIKO. This free program serves as a handy tool for checking the mask positions of photo materials and assisting in creating draft documents. It also includes a simple ruler as an added bonus.

To use CROPFROG, simply activate it and drag your mouse to draw a rectangle on the screen, which allows you to preview and crop the desired area. By continuously pressing the 'C' key, you can draw a circle instead. Additionally, holding down the 'SHIFT' key while dragging ensures that the height and width of the area are scaled proportionally.

Once you have completed the drag, a capture image will appear in the bottom right corner of the screen. You can click on it to download the image. CROPFROG aims to provide a convenient solution for photo editing and document creation needs.