A free app for Android, by vector123.

Create beautiful square photos with the White Border app. The app uses frames to create the square photo. You can fill the frame with any color palette. The square photos can be shared on Instagram, Facebook, WhatsApp, Snapchat, Tumblr, Pinterest, Flickr, Twitter, etc.

The app includes 35 built-in filters, including Pixelation, Sepia Toon, Grayscale, Saturation, Vignette, Kuwahara, Sketch, Smooth Toon, Hue, Gamma, Brightness, Sobel Edge Detection, Threshold Edge Detection, Grouped Filters, Exposure, Highlight shadow, RGB, White Balance, Tone Curve, CGA Color Space, Dilation, RGB Dilation, Toon, Halftone, Glass Sphere, Haze, Laplacian, Swirl, False Color, Color Balance, Zoom Blur, Solarize, Vibrance, Contrast, and Sharpness.

Crop the picture, rotate the picture, zoom in and out, change the crop aspect ratio, and flip the picture.

The app is easy to use, with a clean user interface and a simple design.