If a picture is worth a thousand words, what are millions of images worth? NCBI Images allows you to search about 3 million images from articles in the biomedical literature database PubMed Central, including charts, graphics, and photographs. Searchable fields for the images include caption title and text, author, journal name, and PubMed ID. Search results include thumbnails of the images, a truncated caption, a citation for the source article, and a link to the full text. Mousing over a thumbnail generates a preview of the image; clicking on a thumbnail takes you to a larger version of the image plus its full caption. You can save images temporarily to the clipboard, or permanently as a My NCBI collection. Of course, use of images may be governed by copyright; consult the NCBI Copyright and Disclaimers page for more information.