PikWizard is a free site that offers thousands of high quality images that you can download and re-use for free. Pikwizard provides clear guidance on how you can use each picture that you find on the site. You will find that guidance posted to the right of any picture that you select from search results. PikWizard also provides clear directions on how to give credit to the photographers whose pictures you use.

Applications for Education
PikWizard could be a good site to bookmark for the next time that your students need to find copyright-free images to use in slideshows, videos, or other multimedia projects.

On a related note, if you're a Google Slides user, the Unsplash Add-on provides the easiest way to add copyright-free images to your presentations. Click here to learn how to use the Unsplash Add-on.
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