An image filename, a caption, and alternative text do different jobs. Before adding a keyword to every field, ask what the image contributes to the page. The answer should guide the words a reader encounters when they cannot see that image.
Start with the image’s purpose
Google’s accessibility writing guidance treats alternative text as meaningful communication, not a place to repeat everything nearby. A useful description identifies the information the image supplies in its context. A decorative image and an instructional screenshot do not need the same treatment.
For example, a photograph illustrating a café guide might need a concise description of the scene. A chart supporting a numerical claim needs access to the actual takeaway and data, not simply “chart.” If the surrounding text already provides the full information, consider whether the image adds anything essential.
Keep search context natural
Google Search Central’s image guidance recommends useful descriptive context and warns against stuffing alt text with keywords. A readable filename can help describe an asset, but neither the filename nor the alt text guarantees rankings. Do not add a city or service name that the image does not meaningfully support.
Review the rendered result
- Check that the right image was uploaded.
- Read the alternative text alongside the nearby copy.
- Confirm that any caption serves a separate purpose.
- Check linked images for a clear destination or action.
Also label an illustration when it could otherwise be mistaken for documentary evidence. The goal is a page that remains understandable across viewing conditions and assistive technology—not a collection of metadata fields filled merely because they exist.
AI-generated editorial illustration; the abstract graphic is not a functional QR code or actual client design.
