1.Pixabay
The Pixabay is a very large website to get free images. All the images on Pixabay are released under Creative Commons Zero(CC0) license. That means, you can use the images without attribution. You can also modify the images as suitable for your purpose. The images are of high quality. The Pixabay provides every detail of the image such as time of upload, views, downloads, and the specifications of the camera. You are also given the option to choose the size of the image while downloading.