Unsplash releases 200,000 high-resolution images free to download and use however you prefer.
Anyone can download photo and use it at no cost through the Creative Commons Zero license.
This means comparing to traditional “all rights reserved” copyright, this license guarantees that the person downloading the photo can copy, alter, and distribute it for free, and even use it in advertisements and commercial products. CC Zero essentially releases every Unsplash photo into the public domain.
Unsplash – Free (do whatever you want) high-resolution photos