Image Alt Text for AI Understanding | AiVIS Cite Ledger

Images are invisible to AI language models. Alt text is the only bridge between your visual content and AI understanding. Missing alt text = missing context.

Alt Text as AI Context

AI language models process text, not pixels. Your alt attribute is the only information they receive about an image's content and significance.

Writing AI-Effective Alt Text

Be specific and factual: 'Bar chart showing 40% traffic increase from Q1 to Q3 2025' not 'chart'.

Include relevant context: what the image shows and why it matters to the surrounding content.

For decorative images, use alt='' (empty string) to signal no informational value. Don't fill decorative images with keywords.

Alt Text at Scale

For large sites, prioritize alt text on content images (charts, infographics, product photos) over stock photos.

Create alt text guidelines for content creators: include what, why, and how much detail per image type.

Run an AiVIS Cite Ledger audit to identify images missing alt text automatically.

Frequently Asked Questions

How long should alt text be?
Typically 125 characters or less for accessibility. For AI, focus on accuracy over length, concise factual descriptions work best.
Should I put keywords in alt text?
Only when genuinely relevant to the image. Keyword stuffing alt text is counterproductive, describe what the image actually shows.
Do multimodal AI models need alt text?
Multimodal models can process images directly, but alt text still provides verified context from the publisher. Both signals work together.