If you need a powerful web-based tool to upscale images without sacrificing quality, Topaz Labs has a suite of professional-grade photo and video editing software. Its Gigapixel 7 tool can upscale images up to 600% using large AI models, and it runs on Mac and Windows machines without sending your data to servers. That makes it a good option for pros who need top results without sacrificing privacy.
For a more general-purpose image editing tool, AILab Tools has a variety of tools including photo upscaling, background removal and colorization. It also offers an API interface so you can embed image processing into other tools, which makes it good for photographers and e-commerce site operators who often need to edit and process images.
Last, Free AI Video Upscaler is a basic, browser-based tool that lets you upscale videos with AI algorithms right in your browser. It's based on open-source projects like Anime4K and RealESRGAN for fast and efficient video upscaling, so it's good for quick, high-quality improvements with no software installation or registration required.