Can this upscale low-res fan art for wallpaper use?

Yes, often with major quality improvement for full-screen viewing.

Will SR x4 add unwanted texture to flat colors?

Usually minimal, but check smooth areas and choose the most natural result.

If the source has visible grain or compression noise, denoise first.

Upscale anime images to 4K while preserving line art and character detail for wallpapers, edits, and large screens.

Anime assets online are often distributed at low resolution and compressed, causing jagged lines and soft gradients.

Use Upscale (SR x4) for resolution gains, then verify line consistency in hair, eyes, and high-contrast outlines.

Avoid overprocessing gradients in sky and skin tones. Anime art benefits from clean flat areas with controlled sharpness.