Pexels features free, high quality images, all licensed under Creative Commons Zero (CC0). They say 3,000+ new images are added each month, and the image library exceeds 40,000. Images are sourced from their community of photographers and other sources such as Pixabay, Gratisography, Little Visuals and more.
Browse collection by what’s trending, or search something specific. Click on an image you wish to download, and Pexels will give you a variety of size options to choose from. You can resize directly within the site as well!
There is a lot of great content and the site credits all photographers, even providing an option to donate to photographers you use and like so they can continue to make content. Here is a sample of some of the images available: