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SPECIFICTION
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Anime4K

bloc97.github.io

Free plan WindowsmacOSLinux
Visit bloc97.github.io
Spec score 8.2 #15 of 40 in Video Upscaling Software

What it is

Anime4K is a free, open-source collection of algorithms for real-time anime upscaling and denoising. The algorithms are intended for watching enlarged anime while it plays and can be implemented in any programming language. Anime4K is optimized for native 1080p anime encoded with H.264, H.265, or VC-1, with a listed maximum output resolution of 4K. Its described processing includes line-art CNN upscaling, line-art deblurring, denoising, resampling-artifact reduction, and experimental line darkening and thinning. It is desktop software for Windows, macOS, and Linux. Installation instructions link GLSL configurations for mpv and Plex on Windows and Linux, and for mpv, IINA, and Plex on Mac. The project does not target anime reduced to 720p, 480p, or standard definition, and artifacts in older material may be difficult to remove. The project says SRGANs perform better on low-resolution or heavily degraded images, but they do not run in real time. Anime4K was founded in 2019 and is maintained by bloc97.

Spec sheet

What it does
Anime4K is a set of open-source algorithms for real-time anime upscaling and denoising.Read 8 Oct 2026 · bloc97.github.io
Support
The project asks people who own art assets shown on the site to contact [email protected] to request removal.Read 8 Oct 2026 · bloc97.github.io
License
The GitHub repository identifies its license as MIT.Read 8 Oct 2026 · github.com
Founded
2019Read 28 Sep 2026 · bloc97.github.io
Algorithm features
The project describes real-time line-art CNN upscalers, line-art deblurring, denoising, resampling-artifact reduction, and experimental line darkening and thinning.Read 8 Oct 2026 · github.com
Alternative use case
The project says SRGANs perform better on low-resolution or heavily degraded images, although they do not operate in real time.Read 8 Oct 2026 · github.com
Content limitations
It is not optimized for downscaled 720p, 480p, or standard definition anime, and older anime may contain artifacts that are difficult to remove.Read 8 Oct 2026 · github.com
How it works
The algorithms are designed to let users watch upscaled anime in real time.Read 8 Oct 2026 · bloc97.github.io
Language support
The algorithms can be implemented in any programming language.Read 8 Oct 2026 · bloc97.github.io
Linux integrations
The installation instructions link GLSL configurations for mpv and Plex on Linux.Read 8 Oct 2026 · github.com
Mac integrations
The installation instructions link GLSL configurations for mpv, IINA, and Plex on Mac.Read 8 Oct 2026 · github.com
Maintainer
The official site says Anime4K is maintained by bloc97.Read 8 Oct 2026 · bloc97.github.io
Optimized input
Anime4K is optimized for native 1080p anime encoded with h.264, h.265, or VC-1.Read 8 Oct 2026 · github.com
Security and compliance
The opened official pages provide no security or compliance claims.Read 8 Oct 2026 · github.com
Windows integrations
The installation instructions link GLSL configurations for mpv and Plex on Windows.Read 8 Oct 2026 · github.com

Plans and prices

Anime4K Free Open-source real-time anime upscaling and denoising algorithms Read 8 Oct 2026 · github.com

Every Anime4K plan and price →

Strong points and limits

Strong points

  • Free open-source algorithms
  • Real-time anime upscaling and denoising
  • Windows, macOS, and Linux support
  • Maximum output resolution listed as 4K
  • GLSL configurations for several players

Limits

  • Not optimized for 720p, 480p, or standard definition
  • Older anime artifacts may be difficult to remove
  • SRGANs may suit degraded images better, without real-time operation

Who it suits

Anime4K suits desktop viewers who want real-time processing for suitable anime sources. It is also relevant to developers because the algorithms can be implemented in any programming language.

Verdict

Anime4K provides free real-time processing for supported anime, with configurations for several desktop players. Its source-resolution limits matter when working with downscaled or heavily degraded material.

Where Specifiction places it

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