Question: Can you recommend a tool that can upscale low-quality videos to HD or 4K resolution?

If you want a tool to upscale low-resolution video to HD or 4K, Pixop is a good option. This AI-based online video upscaler has automated filters for ML super resolution, AI denoising, AI deinterlacing and AI deep restoration. Pixop can increase image quality up to UHD 8K, and its pay-as-you-go pricing is geared for independent creators, broadcasters and media companies.

Another option is AVCLabs, which has a variety of AI-based video and photo tools to improve image quality. Its Video Enhancer AI can upconvert low-resolution video to HD, 4K or 8K resolution, and it can also improve video quality with denoising, deinterlacing and facial detail restoration. AVCLabs also has photo editing and background removal tools, so it's good for both beginners and pros.

bigmp4 is another AI-based service that can losslessly upscale video to 2k/4k/8k and improve video quality. It can handle a variety of file formats and has features like video colorization, smooth slow motion and batch processing. With several pricing tiers, including a free option, bigmp4 is a good option for those who want different levels of video upscaling.

If you want a cloud-based service, check out TensorPix. It's a collection of tools to improve video and image quality without having to install anything. It uses GPU-accelerated cloud servers to upscale video and remove noise, and it can also boost frame rate and remove backgrounds. TensorPix offers several pricing tiers, so it should be useful for a range of users.