4K HD Wallpaper: Ladies Victory
The 1st 4K picture featured from Ian & Victoria Schneider's portfolio taken at Golden Gate Bridge, San Francisco, CA, USA. From Ian's courtesy the photography is completely free under CC0 license and can be used in various projects or just set as desktop backgrounds and homescreen phones right from here.
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x2048 (compatible with many tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many phones)