Image alt coverage measures whether important images include useful alternative text for accessibility, search interpretation, and multimodal extraction.
Image alt coverage measures whether meaningful images have useful text alternatives. This supports accessibility, image understanding, and multimodal interpretation.
Good alt text explains the content or function of the image in the context of the page. It should not be a keyword dump.
In the report, use this item as evidence. Do not treat it as a standalone rule unless the surrounding page context supports the same conclusion.
| Image type | Better alt text approach |
|---|---|
| Product image | Describe the product and visible differentiator. |
| Chart | Summarize the main insight, not every pixel. |
| Decorative icon | Use empty alt text when the icon adds no meaning. |
Alt text examples
<img src="/chart.png" alt="Revenue increased steadily from Q1 to Q4 2026" />
<img src="/divider.svg" alt="" />Decorative images can use empty alt text, but meaningful content images need descriptive alternatives.
No. It should describe the image naturally and accurately.