Anime4K

Anime4K is a set of high-quality, real-time upscaling and denoising algorithms for anime. It sharpens and enlarges video as it plays, so native 1080p anime looks crisp on a 4K screen with no slow re-encode and no larger files on disk.

It is delivered as GLSL shaders that drop straight into media players such as mpv, Plex, and IINA. The toolkit covers line reconstruction, line-art CNN upscalers, deblurring, denoising, blind resampling artifact reduction, and line darkening or thinning.

The algorithms are not tied to any specific language or platform and run locally during playback rather than as a hosted service.