A good reference for making sure you’re doing it correctly: The Best Ways to Be Sure You’re Legally Using Online Photos
http://lifehacker.com/5992419/the-best-ways-to-be-sure-youre-legally-using-online-photos
1. A great guide to finding images
2. This video shows how to find Google Images to find images that are free to use.
3. Wikimedia
4. Pixabay
5. MakeUseOf Article listing several sites for free photos
6. CompFight
Flickr search tool. Be sure to view the license agreement and search for creative commons images — this site is awesome because it comes with attribution code. Copy/paste this code and put it in “caption” of the photo.
7. Wikimedia Commons
More than 10 million freely usable media files.
8. PublicDomainPictures.net
The page for each image contains detailed information about the license, the camera used to take it, and links to the artist. The website cleverly supports the creators by offering a premium download and the option to buy the artist a coffee.
9. Image After
Image After offers image you can use for anything. They all have the same licence. You can’t use them to build a competing free images site. You can search by color and size.
10. More Public Domain photos
11. Flickr
Using the advanced search feature, you can search only photos with a Creative Commons license that allows you to use the content commercially and/or modify, adapt, or build upon the content. These two licenses in combination essentially make the image ‘public domain’ in that you can use it for anything. However, the license restriction is that you have to credit the original creator.
12. Pexels
13. Creative Commons Search Engine
14. Great Free Picture
15. Foodies Feed – Free Food Photos
16. Gratisography (license details)
17. SuperFamous
18. FreeStockPhoto.com (license details)
19. Negative Space (license details)
20. Death to the Stock Photo (license details)
21. Picjumbo (license details)
22. IM Creator Free
23. Stokpic (license details)
24. Kaboompics (license details)
25. Startup Stock Photos (license details)
26. Freerange (license details)
27. LibreShot (license details)
28. Fancy Crave (license details)
29. Unsplash (license details)
30. StockSnap.io (license details)
31. SplitShire (license details)
32. Life of Pix (license details)
33. Pexels (license details)
34. Gratisography (license details)
35. Jay Mantri (license details)
36. ISO Republic (license details)
37. New Old Stock (license details)
Completely free high resolution images.
38. Pixabay
More than half million free photos.
39. Realistic Shots
This site offers a lot of very genuine and natural photographs that will give to your project a really personal touch. 7 new photos every week.
40. FreeImages
Almost 400,000 royalty free images are available to download on this site.
41. MorgueFile
You can find here images of everything from wildlife to antiques.
42. Life of Pix
Free high-resolution photos with no copyright restrictions.
43. Splashbase
Splashbase is a search and discovery platform for more than 15 sites of free stock photos.
44. Pixabay
More than half million free photos.
45. Realistic Shots
This site offers a lot of very genuine and natural photographies that will give to your project a really personal touch. 7 new photos every week.
46. Gratisography
High resolution CC0 images for personal and commercial projects.
47. FreeImages
Almost 400,000 royalty free images are available to download on this site.
48. Unsplash
10 new royalty free photos every 10 days.
49. Picjumbo
High resolution images on an easy to navigate website.
50. MorgueFile
You can find here images of everything from wildlife to antiques.
51. Life of Pix
Free high-resolution photos with no copyright restrictions.
52. New Old Stock
Collection of antique photos.
53. Splashbase
Splashbase is a search and discovery platform for more than 15 sites of free stock photos.
54. Freestock
55. FreeDigitalPhotos.net