How to reduce the picture to the size suitable for mobile phone wallpaper

Here, Photoshop CS6 is used to demonstrate the operation process of modifying the image resolution:

Let's first demonstrate how to change a picture with a resolution of 925* 1928 into a mobile phone wallpaper with a resolution of 720* 1080. Open PS CS6 software, press Ctrl+N to open a new window, set the width/height to 720* 1080 and the color to RGB, and click "OK".

Second, after creating this canvas with a resolution of 720* 1080, drag the prepared picture onto the canvas.

Third, after dragging onto the canvas, the free transform will automatically open, and use the free transform tool to reduce/put it to the appropriate size and adjust it to the appropriate display position.

4. Press Enter to cancel the free transform box.

5. Press Ctrl+Alt+S to open the save as window in JPG format, and click Save.

6. Adjust the picture quality according to personal needs in the JPG option, and finally click "OK" to finish the modification.