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Sharpen video with Anime4K ​

Anime4K can sharpen lines and improve how video looks when enlarged. You can use it on desktop and Android. It leaves the source file and stream bitrate unchanged.

Turn it on ​

Open Settings > Sharpen video (Anime4K), or Settings > Watch on desktop, and choose a preset. Desktop shows a short description of each one. The shaders download on first use. To download them ahead of time, choose Download (Download now on desktop). You can also switch presets in the player's Anime4K menu.

The standard shader pack downloads once. Experimental downloads extra shaders when needed.

Pick a preset ​

PresetA good place to use it
OffOriginal playback, or when you want to save power
StandardA starting point for most anime
SoftVideo that already looks fairly clean
DenoiseGrainy or blocky video, with a capable GPU
LightWeaker graphics hardware or a phone running warm
MaximumStrong cleanup on a powerful GPU
ExperimentalVery low-quality video, with a big performance cost
Extra sharpCrisper lines, though faint halos can appear
Extra soft720p video with jagged edges
Denoise + sharpenA starting point for 480p video

Try a scene with faces, line work, and motion to find a preset that suits the show.

If playback gets choppy ​

Switch to Light or Off. Shader processing can use a lot of GPU power, especially on phones. If the video becomes smooth with Anime4K off, the source connection probably wasn't the problem.

You need an internet connection to download shaders. The player shows download progress, then the active preset's name. If the download fails, sharpening stays off for that playback session and tries again next time. Installed shaders work across episodes without another download.

Aikatsu is free software, licensed under GPL-3.0.