ImageColorizer is a free AI-powered online tool that can automatically colorize and restore old black and white photos. It uses AI to add realistic color and enhance details in your images. As well as colorizing photos, there are also tools for upscaling and enhancing image quality, retouching faces, repairing damage, and removing unwanted objects. The free version gives you 20 credits each month, and allows you to upload images up to 2000px in dimension.