A free program for Android, by A Photo Studio.

Square Pic: Photo Editor is an application that allows you to edit your photos with different effects, including borders, filters, and backgrounds. It has the option to set a white or black background, and you can use the blur option to hide the edges of the picture. It will also allow you to add stickers to your photo.

To use it, you need to open the application, choose an image from your device, choose a background, and apply the effects you want. You can also make a collage and share it on social media.