How Can I Get Non-Pixelated Wallpapers? (Galaxy S6)

[AC Question]

Hi. So, my question's obviously in the title there, but to explain a bit: I just got my new phone today and was tinkering with customization. I keep trying to add a new wallpaper but even wallpapers that fit my computer well end up pixelated on the S6. What am I doing wrong, or what can I do to get a wallpaper that isn't all pixelated?

 

[B. Diddy]

Welcome to Android Central! Make sure the image file you're using is the full resolution picture, not a thumbnail.