All of these websites offer free stock photos that can be used commercially, without attribution. Some of them have restrictions that do not allow redistribution, resale, print-on-demand, use in web templates for resale, and some other restrictions.
The reason for this list is so you don’t have to worry about attribution. Just comply with the terms as they are outlined by the site that is giving away the photos. As long as you do what they want and don’t use their photos for purposes they don’t agree with, you have nothing to worry about.
When in doubt as to whether your usage falls within what they consider acceptable, contact the site and ask before you use it. The worst they can do is say “no”, in which case you just go look for another photo with a more generous license.
Burst has photos released under a Creative Commons CC0 license, as well as under their own license. In both cases, you may use them for commercial purposes, without attribution. The photos under their own license can not be used to create a competing service.
Canva has a collection of free photos that you can download and use, commercially, without attribution. You will need to create a free account to be able to download them.
Free Stock Photos
Free Stock Photos has tons of photos with varying licenses, many of which allow for commercial use, including items meant for resale. Check the license terms included on the page with each photo.
FreeImages offers lots of high quality stock photos, free of charge, under a standard license that allows you to use them commercially, provided they are not being redistributed, used in web templates for resale, print-on-demand, or items where the photo is the main focus of the item. They were previously known as Stock.xchng, till their parent company was bought out by Getty. All of their commercial assets were then added to Getty’s collection. The old free photos site was then spun off as FreeImages.com.
Free Media Goo provides free images, audio files, textures and flash files that you can pretty much do whatever you please with them except use them in propaganda, pornography, or anything suggestive, according to their license.
Freerange Stock offers photos you can use for just about anything. They request that you give credit, but they also say it isn’t required if you don’t want to. There is a credit and link requirement if you use their photos as part of a web template, though.
freestocks.org has many photos you can use for commercial purposes, released under a Creative Commons CC0 license. While the license terms published on the site says they are all CC0, it also says you can’t sell the photos, themselves. But the CC0 license actually allows you to do just that. So, I’d be a little careful with this site, as they don’t seem to want to adhere to the letter of the license type they have chosen for their photos.
Gratisography claims to be the world’s quirkiest collection of free high-resolution pictures. I am not totally sure about that, but I am sure that they have a very generous license that allows you to do pretty much anything you want with their images, so long as it doesn’t involve redistribution of the image files or usage on merchandise where the image would be the main focus of the item.
Image*After lets you do anything you want with their photos, as long as you don’t use them to set up a stock photo site that competes with theirs.
Morguefile has some very generous license terms that even allow you to sell the images, as images, as long as you have altered it so that it isn’t identical to the original (and I don’t think mere resizing counts as altering). If you use the photos as-is, without changing them somehow, then you have to give credit to the original creator.
Nappy is a website dedicated to providing free, beautiful, high-res photography of black and brown people, under a Creative Commons (CC0) license.
NASA, as a government agency, exists to benefit the citizens of the US, and is funded by tax money collected from those same citizens. All of the images they produce, therefore, belongs to those citizens, aka the public domain, and you can do whatever you wish with them.
New Old Stock
New Old Stock has vintage photos from the public domain, that have no known copyright restrictions, so you may do whatever you wish with them.
PDPhoto.org has some really nice images that you can do whatever you please with, as they are all dedicated to the public domain.
Pexels has lots of free stock photos that you may use commercially, even in web templates, and for printed items, so long as you alter them in some way that adds to their value. The only thing you can’t do is sell them as stock photos. There’s even a WordPress plugin available that makes it easy to add their photos to your blog posts.
Photo Rack says there are no limitations on the use of their images. There’s no site search, but photos are grouped into categories, with an extensive list of sub-categories, to make finding what you are looking for a little easier.
PhotoGen has images that are good for the standard commercial uses that don’t involve redistribution or print on demand, or on items for sale where the photo would be its main feature.
PicJumbo has lots of free stock photos available under a generous license that allows you to do pretty much anything, as long as it doesn’t involve the restribution or sale of the image files, or as part of a competing service. They also have a Pro service available as a paid subscription, with even more photos.
PICNOI provides free stock photos focusing on racial diversity, under a Creative Commons (CC-0) license.
Picography is another Creative Commons CC0 stock photo site. The site’s licensing terms do try to restrict the rights granted under the CC0 license the creators have chosen for their photos, though, by not allowing you to claim the photos are your own work. CC0 has no restrictions on usage or attribution, and is a declaration by the creator that they are giving up all rights to their work, including the right to be recognized as the creator. So, beware! The site owner may not actually understand the license their photographers have chosen and what rights you actually have under that license.
Pixabay has lots of free stock photos that you may use commercially, even in web templates, and for printed items, so long as you alter them in some way that adds to their value. The only thing you can’t do is sell them as stock photos.
Public Domain Pictures
Public Domain Pictures is a repository for free public domain photos. You can do anything you want with them, but keep in mind that none of the photos have model or property releases.
Public Domain Project
Pond5’s Public Domain Project provides thousands of historical photos that you may use for any purpose.
PublicDomainPhotos.com has images you can do anything you want with, no restrictions.
Rgbstock offers free photos that follow the standard license of not allowing redistribution, usage in web templates for resale, or any other item for sale, where the photo is the main focus of the item. However, you are free to contact the creator of the photo to ask for permission, if your usage will fall outside what is permitted by Rgbstock’s license terms.
Skitterphoto advertises themselves as a place to find, show and share public domain photos. All photos on the site have a Creative Commons CC0 license, which means you can do whatever you want with them, including redistribution, using them on articles for sale, print on demand, and even to create a competing service.
Smithsonian Open Access
The Smithsonian Institute has released over 2.8 million high resolution 2D and 3D images into the public domain, under a CC0 license. The collection features data and material from all 19 Smithsonian museums, nine research centers, libraries, archives and the National Zoo. You are encouraged to browse, use, reuse, and transform the materials into anything that you wish.
StockSnap has lots of Creative Commons CC0 images that you can use for any purpose you wish.
The Flickr Commons
The Flickr Commons contains tons of photos and other images that are in the public domain, with no known copyright restrictions.
Unprofound was created by designers, for designers and will pretty much let you do anything with their photos except redistribute them as stock photos. The only payment they want is the pleasure of knowing what their work has become. All they want in return is to be able to see what you have done with them, which means either sending them a photo of your product, screenshot of your software, link to your website or template, or whatever other way you can show them what their images have become part of.
Unsplash has plenty of photos that you can use for whatever purpose you need, except to offer a competing service.