Make sure to go to Tools and then Usage Rights to limit to just openly-licensed images.

Creative Commons' search tool. Can limit to just images using the drop-down to the right of the search box.

Search for Creative Commons licenses using the Any License limiter on the upper left.

All images and videos on Pixabay are released free of copyrights under Creative Commons CC0. You may download, modify, distribute, and use them royalty-free for anything you like, even in commercial applications. Attribution is not required.

A public domain image repository.

A repository for free public domain images. Download high quality HD photos or upload your own.

Repository of public domain images and other media content available in a wide variety of languages.

Europeana searches various art collections from all over Europe. Copyright status will be indicated per individual images.

The Getty makes available, without charge, all available digital images to which the Getty holds the rights or that are in the public domain to be used for any purpose. No permission is required. Please use the following source credit when reproducing an image: Digital image courtesy of the Getty's Open Content Program.

The Metropolitan Museum of Art is committed to making a broad range of digital images of artworks in the public domain widely and freely available for scholarly and academic publication. To assist in navigating the vast image content on this website, the Museum has implemented Open Access for Scholarly Content (OASC). Through OASC, artworks in the Collection section of the website which the Museum believes to be in the public domain and free of other known restrictions have been identified by an icon, and images associated with these artworks can be downloaded for license- and cost-free scholarly and academic publication, according to the Terms and Conditions.

More than 45,000 images from the National Gallery of Art are made available open access.

Yale makes public domain images available for download and the rights status of the work is clearly displayed under the image on each object record.

The New York Public Library has organized a huge collection of really wonderful public domain images, and made them all available to the public including illuminated manuscripts, historical maps, vintage posters, rare prints, photographs and more.

Looking for high resolution stock photos for your illustration, comp or design needs? Search morgueFile for free reference images. Yes, they're all completely free. whether you're an illustrator, art director, instructor or looking to add a defining visual to a presentation.

Images submitted to Open Clip Art are entered into the public domain.

Clcker is a collection of clip art and images either submitted by users or drawn on the website. Users submitting material certify that the material is in their own work and enter it into the public domain upon submission.