Background Eraser for Android

Smooth Edge

The image edge may be jagged when the "None" is selected.

You can make the image edge smoother by selecting the "+1" or "+2" button.
The "+1" is selected as a default.

Tap the right-top "Save" button to save the edited image. It will take slightly longer time to save images with transparent color.

The transparent color is shown as black color in the apps such as "Gallery", "Photos". However, the transparent color is kept in the photo files. You can check this by reloading the image to this app.