Can this fix compressed anime wallpapers from social media?

Yes, especially when artifacts and blur are moderate.

Should I use 4x for phone wallpapers?

Only when the source is very small. For most phone targets, lighter enhancement is enough.

Yes when enhancement is balanced and not over-sharpened.

Enhance anime wallpaper quality for large monitors and phones by improving clarity and reducing compression defects.

Wallpaper images are frequently downloaded from reposts with unknown quality, leading to softness and visible artifacts on high-resolution displays.

Use Focus Restore for mild softness and SR x4 when original resolution is too small for your target screen.

Match output dimensions to your device to avoid extra scaling by the operating system.