Resizing images affects their quality, but it often isn’t noticeable. The best way to ensure a quality outcome is to start out with a high resolution image and consider the size of the container you want it to fit. When you change photo size to dimensions that are equal or slightly bigger than the container, you’ll end up with a high quality image. Shrinking photo size has little effect on its quality, but when you enlarge or stretch an image it can become blurry or pixelated. For example, if you downsize an image that is 2400 x 1200 pixels to fit a 600 x 400 blog banner, you will end up with a high quality image. On the other hand, if you enlarge the same image to 4800 x 2400 pixels, it will appear pixelated and lower quality.