Alt text is how a screen reader and an image-blind crawler understand an image. A missing alt attribute fails accessibility and forfeits image-search context. Images lack alt text. Alt is processed at indexing and is essential for accessibility and image search.
Why does missing alt attribute matter for AI search?
Alt is processed at indexing and is essential for accessibility and image search.
How do you fix it?
Add descriptive alt to meaningful images.
How do you find it on your site?
- Crawl for img tags with no alt attribute.
- Prioritise content and informative images.
- Add concise, descriptive alt text for each.
- Leave alt empty only for purely decorative images.
Which ranking and citation factors does it touch?
Alt text supports accessibility and image search and gives context for AI. Missing it loses both.
What is the impact?
Medium. Direct.
What is the evidence?
alt attributes are processed and aid image understanding/a11y. Google Search Central, In-Depth Guide to How Google Search Works; Google Search Central, Image SEO best practices; W3C, Web Content Accessibility Guidelines (WCAG) 2.2
Sources
Frequently asked questions about missing alt attribute
What does "Missing alt attribute" mean?
Images lack alt text.
How do you fix missing alt attribute?
Add descriptive alt to meaningful images.