# SEO Images

> Use when optimizing images for SEO — alt text, filenames, formats, lazy loading, responsive sizing.

- Skill: `fusengine/seo-images` (Agent Skill)
- Install (CLI): `npx skillmds@latest add fusengine/seo-images`
- Raw SKILL.md: https://api.skillmd.com/api/skills/fusengine/seo-images/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Marketing & Growth
- Author: fusengine (https://skillmd.com/u/fusengine)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/fusengine/seo-images

---


<objective>
Checks image SEO fundamentals: descriptive `alt` text (empty only for decorative images), kebab-case descriptive filenames, modern formats (WebP/AVIF with JPG/PNG fallback), `loading="lazy"` on below-fold images, responsive `srcset`/`sizes`, explicit `width`/`height` to prevent CLS, ImageObject schema, and file-size/quality targets per image role (hero/content/thumbnail).
</objective>

# Image SEO

## Checks

- All `<img>` have descriptive `alt` (empty `alt=""` only for decorative)
- Filenames: kebab-case, descriptive (`red-running-shoes.webp` not `IMG_1234.jpg`)
- Formats: WebP/AVIF with JPG/PNG fallback
- Lazy loading: `loading="lazy"` on below-fold images
- Responsive: `srcset` + `sizes` for different viewports
- Dimensions: `width` + `height` set to prevent CLS

## File Optimization Targets

| Type | Format | Max size | Quality |
|------|--------|----------|---------|
| Hero | AVIF/WebP | 200 KB | 75-80 |
| Content | WebP | 100 KB | 75 |
| Thumbnail | WebP | 30 KB | 70 |

## References

- `skills/seo/02-onpage-seo/alt-text-images.md`