BgSub is a highly-automated web application that utilizes AI technology to efficiently remove or replace backgrounds from images. The tool's functionality doesn't require image uploads, thus offering significant privacy protection to users. It features high precision, and for further visual enhancement, it includes an AI Coloring feature which intelligently adjusts the color of the processed images. Beyond just removing backgrounds, BgSub also allows users to replace them with a choice of color, gradient, or a different image. It provides free adjustment of size, position, and mirroring as well as the opportunity to apply various artistic effects. BgSub is exceptionally beneficial for individuals wanting to modify their social media photos, web/app developers needing attractive images, photographers looking to change backgrounds without the use of a green screen, e-commerce sites needing to enhance product images, and anyone in media or marketing requiring eye-catching images. Despite the AI-based complexity of the tool, BgSub offers an easy-to-use interface and quick results, making image background alterations a simple task.