Training modules/dashboard/slides/11114-how-to-use-elsewhere
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How do you use images elsewhere?
[edit]The works on Commons aren't exclusively for Wikipedia. You can use your Commons images on other projects, too.
Make sure to check the copyright restrictions on the image you want to use. Most will specify requirements for using the image, such as linking back to the source and giving proper attribution (credit) to the person who created the work. Some won't have any restrictions at all.