1- Open Canva and select your design size.
2- A new window will open. Click on layouts.
3- Pick your design (or create your own). Adjust as needed.
4- Click on File and then Magic resize.
5- A new window will appear. untick the sizes you do not want and tick the ones you do.
6- Click the magic wand.
7- A new internet browser window will appear. This will have your new resided image in it. From here you can download the new resized image.