I've seen some topics on this before but I never came across a clear answer so that's why I'm making this post. I'm really sorry if a lot of people already know this. I couldn't find the answer I wanted/needed so, even if this solution is known, I hope it helped someone! Like many others, I enjoy saving high quality images (.jpg) and setting them as wallpaper. For the longest time, I've wondered why some images seemed to degrade in quality after setting as wallpaper. I'd notice this most on my homescreen. I eventually just accepted that iOS compresses the images to save memory (this was what I had read). ( ) Today, I was shocked at how great a wallpaper looked on my new iPhone 6, and I thought it was just the great display. But it wasn't! I had actually set a screenshot of the original image as wallpaper, rather than the original image. Screenshots save as .PNG when pictures on our iPhone's are taken as .JPG (of course as well as many pictures you download). It turns out that iOS DOES compress files when setting as wallpaper, but when PNG's are compressed, they do not lose quality. JPG's DO lose quality! So now when setting a JPG as wallpaper, I take a screenshot first of how I'd like it to look on my lockscreen, THEN set the screenshot as wallpaper, which preserves the quality! Linked are sample images of the issue/solution. First, is the original picture. Second, is the original picture set as wallpaper. Third is a screenshot of the original image then set as wallpaper. I don't know how to embed these in this post, but let me know and I'll do that. http://imgur.com/a/qhyEO EDIT: Also, I meant to delete that 1 attachment. Mods, please do that for me! Thanks!