Find high-resolution images on a specific topic by using searchable photo databases such as Pixabay.com, Morguefile.com, Stockvault.net, Dreamstime.com and Freeimages.com. Other sites that provide high-quality photos but don't offer a search function include Picjumbo.com, Unsplash.com and Pickupimage.com.
Pixabay provides images that are free from copyright and are published under Creative Commons, a non-profit group that allows the modification and sharing of creative works with the use of freely available legal tools. You can use, copy, distribute and edit the images for both personal and commercial purposes. No registration is needed to use the site.
Morguefile offers photos that are submitted by users to be included in creative works. Visitors need to complete a short registration form and credit the original photographer as much as possible.
Stockvault features a collection of stock photos and graphics shared by designers, photographers and students. The use of the images in non-commercial or personal creative works is allowed. No registration is required.
Dreamstime is a popular image-sharing website that offers both paid and free photos. Both categories are frequently updated, but visitors must create an account before downloading any images.
Free Images offers more than 350,000 searchable stock images available for downloading. The gallery is separated into categories, but requires users to sign up for an account first.