Multiple Photo Editor has none background option. After remove background of your photo, if you don’t want to set any background to your photo you can choose none background option. Your photo will get white background with this option

Multiple Photo Editor - Multiple Photo Blend has single color background option. If you don’t like white background, select any single color to set as background color of your photo. Either light color or dark color, you have the control of all colors. It has multi colors to select any apply.