There are several online tools available that can help you upscale an image from 1080p to 4K or 8K resolution. These tools use artificial intelligence algorithms to enhance the quality of the image and increase its resolution. To use these tools, you typically need to upload your image to the website, select the desired upscale quality, and then wait for the AI to automatically upscale the image. Some of the popular online tools for image upscaling include Free Image Upscaler, Pixelcut, Fotor, and iLoveIMG. These tools usually offer a user-friendly interface and allow you to easily upload and convert your images to higher resolutions. Additionally, some video editing software such as VideoProc Converter AI also offer the ability to upscale videos to 4K or 8K resolution.