First of all, you can drag and drop or open an image file to the Image-Resizer. If you want to change image size, set new size and click 'change' button. If you want to clip image, drag the image in the app, you will get a clip range. You can set the clip size after drag the range.'ESC' button can cancel clip,'Enter' key can confirm clip. If you want revert image to opened, click 'Revert' button. Save image you can click hot key or menu.