[Oni]

If you've ever had 1080p/720p wallpapers that looked awful, Waifu2x is an excellent option for upscaling them.

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Settings

Styles:

• Artwork, Artwork/Scans, Photo
  
• Determines how the image is upscaled. "Photo" works better for actual photos or cinematic imagery. Varies depending on wallpaper. Some anime looks good under "Photo".
  

Noise Reduction:

• None, Low, Medium, High, Highest
  
• If your image is already lossy or has pixellation around the edges of characters, this will reduce the artifacting. I recommend starting with the lowest and increasing if more is needed.
  

Upscaling:

• None, 1.6x, 2x, 4x
  
• How large the image will become after you submit it. If you submit an image that is 720p under 2x, it will become 1440p.
  

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Visit:
https://www.waifu2x.net/

Github/Source:
https://github.com/nagadomi/waifu2x