Key takeaways
- Alt text is the primary machine-readable description of images — models use it when summarising pages and product detail
- Generic alt text ('image', 'photo1') wastes a GEO signal and fails accessibility requirements
- Product and diagram pages benefit most — one accurate alt per image can change how AI describes your offer
- GEO-friendly alt text is specific, contextual, and under ~125 characters when possible
- Page-level audits beat one-off fixes — scan entire URLs for missing or weak alts
Images are not decoration for GEO — they are evidence. When an AI engine explains your product, compares features, or summarises a tutorial, it often relies on alt text and surrounding copy because it cannot “see” the page the way a human does.
Weak alt text (“logo”, “screenshot”, “image3”) is a missed citation surface. Strong alt text is a concise, factual caption a model can quote.
Alt Text vs Captions vs File Names
| Element | GEO role |
|---|---|
| Alt attribute | Primary accessibility + machine description |
| Visible caption | Supporting context |
| File name | Minor hint only — do not rely on IMG_4021.jpg |
What Good Alt Text Looks Like
Bad: alt="dashboard"
Good: alt="GEO Score Checker showing 58/100 with failing llms.txt and FAQ schema signals"
Bad: alt="team photo"
Good: alt="GeoFundamentals team at Brighton SEO conference 2026"
Rules:
- Describe what matters for the surrounding section
- Include entity names (product, feature, data point) when relevant
- Avoid “image of” padding
- Do not keyword-stuff
Accessibility and GEO align
WCAG-compliant alt text is usually GEO-compliant. One edit serves two audiences.
Which Pages to Prioritise
- Product and feature pages with UI screenshots
- Comparison tables exported as images (prefer HTML tables instead)
- Blog hero images that convey data — alt should state the chart’s takeaway
- Ecommerce category images — product type + key attribute
See how alt and structure signals score on your URLs
GEO Score Checker
30-second analysis · 9 signals · no account needed
Auditing at Scale
Manual fixes on ten images are fine. Marketing sites with hundreds of images need a URL-level scan that lists every <img>, flags missing alts, and suggests replacements.
Scan any page URL and get AI-suggested alt text for every image
Image Alt Text Optimiser
ProScores every image · AI-generated replacements · Pro plan
Alt text GEO sprint
- Pick top 10 revenue URLs
- Run alt text scan on each
- Fix missing alts in CMS
- Replace generic alts on product UI shots
- Re-run GEO Score on one URL to confirm improvement
Related reading
Frequently Asked Questions
Does alt text affect Google Image Search? Yes — traditional image SEO benefits overlap with GEO clarity.
Should decorative images have empty alt?
Use alt="" for purely decorative images — correct for accessibility.
Can AI generate alt text automatically? Yes — review suggestions for factual accuracy before publish.
Is alt text enough without body copy? No — pair with answer capsules and headings on the same page.