Pixabay

Pixabay is a website to share images. You will find more than one million of free images provided by photographers and illustrators from the Pixabay community. These images are released under Creative Commons (CC0), a free licence to put the work to the public domain. Therefore, you can use them for free to illustrate your website.

In the file selector, click on the Public files tab then, choose Pixabay in the sidebar. A search, sort and filter engine allows to easier target the desired images.