The images that are in public domain, or licensed under the Creative Commons license, can be used without any copyright issues. If you are not in a mood to invest money in high quality professional images for your website or commercial use then you can look at following five places which host images under CCo licence which means you can use any image doe any purpose.
1. unsplash.com – One of the best website for downloading high-resolution photographs. Subscribe to the email newsletter and you’ll get 10 photos in your inbox every 10 days.
2. google.com (LIFE) – The Google images website hosts millions of historical photographs from the LIFE library. You can add source:life to any query in Google image search to find these images and they are free for personal, non-commercial use.
3. picjubmo.com – Here you’ll find exceptionally high-quality photos for your personal and commercial use. The pictures have been shot by the site owner himself and all he requests for in return is proper attribution.
4. pixabay.com – All the images on Pixabay are available under the CC0 license and thus can be used anywhere.
5. superfamous.com – Another great resource for finding high-res images for your websites and other design projects. The images are licensed under Creative Commons and require attribution.