I'm afraid the Photo Resize app cannot make your images bigger or smaller within their canvas.
The app is designed to adjust your images' aspect ratio - to either 1:1 (square), 2:3 (portrait), or 4:3 (landscape) - by adding spaces or borders around your images.
(Check the samples below for how the borders are added.)
If your goal is to make your images occupy more (or less) space within the canvas, or simply apply a uniform border around all your images, you may want to check out our Image Editing On-Demand app instead.
Send us a message at email@example.com for more details.
*I used a light blue border here to make it more visible