Waifu2x

Waifu2x is a completely free AI for upscaling images and enhancing their quality by removing noise and artifacts. Initially designed for drawn images, such as anime art, it also works well with regular photographs.

This AI is available online without registration — simply upload a file on waifu2x.net, select the type of image, the level of upscaling, and other settings. The Waifu2x interface is available in English and other languages.