> ## Documentation Index
> Fetch the complete documentation index at: https://wiki.platelunchcollective.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Image Alt Text

> Image alt text is descriptive text added to an HTML image element that helps search engines and AI systems understand the content of an image and improves ac...

*Technical implementation* · *Technical SEO*

## Definition

Image alt text is descriptive text added to an HTML image element that helps search engines and AI systems understand the content of an image and improves accessibility for screen reader users. Alt text is a valuable text-based signal available to AI crawlers for image content.

## Why It Matters for AI Search

AI crawlers process alt text as the text representation of visual content. Images without alt text may be less effectively understood by AI retrieval systems, as they lack explicit textual context — modern AI can still extract some visual information, but alt text significantly improves accuracy and [entity signal](https://www.platelunchcollective.com/services/entity-seo) coverage. Entity-explicit alt text — naming the people, places, products, or concepts depicted — extends the entity signal coverage of a page to its visual content. For brands that communicate through visual formats, properly attributed alt text is a meaningful AI SEO factor.

## Related Terms

<CardGroup cols={2}>
  <Card title="Content extractability" href="/ai-search-glossary/content-extractability" />

  <Card title="Machine readability" href="/ai-search-glossary/machine-readability" />

  <Card title="Entity-rich content" href="/ai-search-glossary/entity-rich-content" />

  <Card title="Technical SEO" href="/ai-search-glossary/technical-seo" />

  <Card title="Multi-modal search" href="/ai-search-glossary/multi-modal-search" />
</CardGroup>

## Relevant Plate Lunch Collective Services

[AI SEO](https://www.platelunchcollective.com/services/ai-seo)  [Citation-Ready Content](https://www.platelunchcollective.com/services/citation-ready-content)