Finding royalty free stock images for commercial use for your blogs and website can be a pain. Just hit a search query in any search engine like Google, Bing, and Yahoo for stock free images and royalty free stock photos or images will bring you a deceptive websites that required sign up or payment to download images.
I have done the dirty work for you and compiled all the resources to download royalty free stock images so that you can get free stock images that fall under the Zero Creative Common License or similar, which means you can download and modify those images according to your needs. Even for commercial use, without asking for any permission or provide attribution before using images.
Free Stock Images for Commercial Use
All of the sites have their own terms and licenses. I have compiled websites specifically that offer Zero Creative Common Licenses or similar that the images are free to use for commercial websites and blogs. But still you will have to ensure that each site carefully, as policy of these websites may change over time.
Note: Always read terms and conditions of each time you visit a stock free image website before using their images.
Here are the sources of Royalty Stock Free Images.
Pixabay
License: Creative Commons Zero. See License.
Why Pixabay: Over 3, 20,000 stock free photos, vectors and illustrations.
Pixabay is the most popular website for royalty free stock images with more than 4, 20,000 images to fulfill your needs of images, vectors, and illustrations.
One the best part of this website, there is no confusing images license to worry about. You can use any image of Pixabay without any digital and printed form and this includes for both personal and commercial use.
Pexels
License: Creative Commons Zero. See License.
Why Pexels: They add 10 new photos every 10 days.
Pexels is adding high quality images in its collections on daily basis which currently sits at more than 2700. 
With a minimum of 70 images on Pexels weekly, the Pexels library is increasing by approximately 3600 images each year.
StockSnap
License: Creative Commons Zero. See License.
Why StockSnap: This website has an awesome search function with hundreds of Hi-Resolution images added weekly.
StockSnap is an amazing website to download stock free images, which are free from copyright restrictions and they don’t require attributions. 
You can browse images using filter that provide newly updated picture that are updated on weekly. There is also stream of trending photos that gives you instant access of most downloaded images.
Snapwire Snaps
License: Creative Commons Zero. See License.
Why Snapwire Snaps: They add 7 new photos every 7 days.
Snapwire Snaps is another free resource that delivers images straight to your inbox in every week with seven offerings. If you are using Tumblr you follow them for daily updates. With the over a year’s of worth photos, this isn’t a huge database for stock photos but you can add into your bookmarks its really worth it. 
There are some of the more creative images that are available for free and attached to Zero Creative Common License.
Pikwizard
License: User Licence Agreement. See License.
WhyPikwizard: They add 10 new photos every 10 days.
Pikwizard is an another free images library for your blogs and digital products. You can browse thousand of interactive images on their website.
Unsplash
License: Creative Commons Zero. See License.
Why Unsplash: They add 10 new photos every 10 days.
Unsplash is a great source of interactive and artistic images for your blogs and digital products. You can browse thousand of images on website as well as subscribe to receive 10 news images every 10 days, delivered straight to your inbox.
All of the images that are published on this Unsplash fall under the Zero Creative Commons License. You are allowed to copy, edit, and distribute the images without any attribution or credit. It’s always a nice gesture to give credit where it is due.
Death to the Stock Photo
License: Creative Commons Zero. See License.
Why Death to the Stock Photo: They provide premium and free plan that deliver stock photos monthly or weekly straight in to your inbox.
An unforgettable name, Death of The Stock Photo is the most popular source of stock free images. 
It has two options: free plans that deliver fresh stock images straight to your inbox monthly and a paid plan that is monthly $15 that provide access of full stock photos library in addition to a premium – only package of images every month.
Flickr
Flickr has always been a reliable source of free images. But peoples are unable to understand the license policy of flickr to use images. It is important to understand what Creative Common License is attached in images.
In Flickr there are eight different license categories and not all images on flickr can be used in a same way.
You are allowed to use images in the Free Use Photos section are available for everyone and you don’t have to provide any attribution or credit to the creator.
