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"Over 440,000 free photos, vectors and art illustrations"
"Finding free images of high quality is a tedious task - due to copyright issues, attribution requirements, or simply the lack of quality. This inspired us to create Pixabay - a repository for stunning public domain pictures. Your source for royalty free stock photos and copyright free vector graphics. You can use any Pixabay image without attribution in digital and printed form, even for commercial applications."
Other great resources for royalty free images*:
*Disclaimer: The "Other great resources" are to be used at your own discretion. We're not lawyers. Please read the terms of these sites carefully especially when using these images for commercial use (ie for your business).