Steps:

1. Click the "Choose file" button to select an image file (*.JPG, *.PNG, *.GIF) on your computer.

2. Select the image region you want to crop. You need to double-click on the background image to select it first if you want to move the background image.

3. Click the "Submit" button, then click the "Download" button on the pop-up window to download the cropped image.