What Alt Text Should a Clickable Photo Thumbnail Have?
By ImgHeal · Updated
A family gallery thumbnail can be both a photograph and a control. Help readers understand what activating it does, especially when several versions of the same portrait lead to different destinations.
Explore this topic: Share restored photos
Identify the destination of each thumbnail
Open the link and record whether it leads to a larger viewing image, a source catalogue record, another page, or a file download. Distinguish the restored copy from the original scan. A visually obvious portrait does not explain its link behavior to someone navigating a list of controls. Check repeated thumbnails too: two similar images may lead to quite different records. Do not promise a high-resolution download when the destination is merely another preview page with no accessible route to the file.
Write the functional label in context
Follow W3C's distinction between informative and functional images. The accessible name of an image-only link should communicate its purpose, using the photo's identity where needed to distinguish it from neighboring links. For example, identify that the control opens the restored portrait's larger view or its original archive record. If nearby link text already supplies an adequate name, avoid making the same information repeat unnecessarily. Keep a fuller description of the scene in the appropriate image or page text rather than forcing every detail into the control label.
Navigate the gallery without relying on pictures
Use the keyboard to move through the actual published links and inspect their names with available accessibility tools. Check that neighboring original and restored links are distinguishable and that a download is not mislabeled as a simple enlargement. Confirm the destination still matches the wording after replacing files or reorganizing the gallery. When a link opens a new context, provide useful notice where appropriate to the site's design. A clear thumbnail label should help a relative choose the right action before activating it.
Check before sharing this record
- Check the actual link destination.
- Distinguish source, restoration, preview, and download.
- Review neighboring link names without visual clues.
Sources and further reading
- W3C WAI: Images tutorialChoosing text alternatives according to an image's purpose and context.
Questions about this restoration task
Can the alt text simply be the person's name?
That may not explain an image-only link's purpose. Consider the surrounding text and distinguish the action, such as opening the portrait's source record, from merely identifying the sitter.
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