If you're looking for another option besides the Free AI Video Upscaler, TensorPix is a good choice. It's a cloud-based service that offers a collection of AI-based tools to improve video and image quality without any software installation. TensorPix can upscale to 4K, remove noise and increase frame rates, so it's a good all-purpose option for sprucing up multimedia files.
Another good option is Pixop. It's a web-based tool that can upscale to UHD 8K and that offers AI denoising, deinterlacing and deep restoration tools. Pixop's pay-as-you-go pricing is flexible and secure, so it's good for independent creators and media companies looking to beef up their video.