Remini is an AI-powered system that can upscale low-resolution photos and videos into high-resolution images. It has options to enhance faces, color, noise and background detail. It's useful for upscaling photos without losing quality, restoring old and faded photos, and creating realistic photos that look like they were taken by a pro.
Another good option is the Face Photo Restorer, a free service that uses AI to improve photos. It's designed to be easy to use even if you don't have editing skills, and you can use it to restore old, blurry or damaged photos to their original state. People have praised the service for ease of use and results.
If you want something more general purpose, VanceAI offers a variety of tools including an AI Image Restorer, Upscaler, Sharpener, Denoiser and Background Remover. VanceAI is geared for pros and businesses that have a lot of photos to process, with tiered pricing and no watermarks on output.