waifu2x

waifu2x is a free, open-source AI image upscaler that uses deep convolutional neural networks to enlarge images while reducing noise and preserving quality. Originally designed for anime-style art and illustrations, it has become widely popular for upscaling all types of images. The tool supports up to 2x upscaling with adjustable noise reduction levels and is available both as a web app and self-hosted solution.

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