For PC/Mac

In most cases you should click on the below images to enlarge one, then simply right click on it and select the option to 'set as desktop background'. In other cases, you will first have to save the image on to your hard drive then right click on it from there. If it looks distorted, try setting your wallpaper position option to 'Fill' or 'Centre'

 

Ultra Wide (3440 x 1440)

Full HD (1920 x 1080)

Large (1600 x 1200)

Medium (1280 x 1024)

Small (1024 x 768)

For iPhone

Touch and hold to trigger the option to save image. The go to 'Settings -> Wallpaper & Brightness -> Choose Wallpaper' to set it as your lock screen

iPhone 5 set & scale friendly (1280 x 2272)

iPhone 5 (640 x 1136)

iPhone – iPhone 4 (640 x 960)