# SEO Images

Image optimization analysis for SEO and performance.

- Repository: https://github.com/AgriciDaniel/claude-seo (25484 stars)
- Category: Marketing
- License: MIT
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add AgriciDaniel/claude-seo --skill seo-images -g -a claude-code -y`
Codex: `npx skills add AgriciDaniel/claude-seo --skill seo-images -g -a codex -y`
Cursor: `npx skills add AgriciDaniel/claude-seo --skill seo-images -g -a cursor -y`
Gemini CLI: `npx skills add AgriciDaniel/claude-seo --skill seo-images -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add AgriciDaniel/claude-seo`

## Description

Image optimization analysis for SEO and performance. Checks alt text, file sizes, formats, responsive images, lazy loading, CLS prevention, image SERP rankings (via DataForSEO), and image file optimization (WebP/AVIF conversion, IPTC/XMP metadata injection). Use when user says "image optimization", "alt text", "image SEO", "image size", "image audit", "optimize images", "image metadata", "image SERP", "convert to webp", or "image file optimize".

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Image Optimization Analysis

## Checks

### Alt Text
- Present on all `<img>` elements (except decorative: `role="presentation"`)
- Descriptive: describes the image content, not "image.jpg" or "photo"
- Includes relevant keywords where natural, not keyword-stuffed
- Length: 10-125 characters

**Good examples:**
- "Professional plumber repairing kitchen sink faucet"
- "Red 2024 Toyota Camry sedan front view"
- "Team meeting in modern office conference room"

**Bad examples:**
- "image.jpg" (filename, not description)
- "plumber plumbing plumber services" (keyword stuffing)
- "Click here" (not descriptive)

### File Size

**Tiered thresholds by image category:**

| Image Category | Target | Warning | Critical |
|----------------|--------|---------|----------|
| Thumbnails | < 50KB | > 100KB | > 200KB |
| Content images | < 100KB | > 200KB | > 500KB |
| Hero/banner images | < 200KB | > 300KB | > 700KB |

Recommend compression to target thresholds where possible without quality loss.

### Format
| Format | Browser Support | Use Case |
|--------|-----------------|----------|
| WebP | 97%+ | Default recommendation |
| AVIF | 92%+ | Best compression, newer |
| JPEG | 100% | Fallback for photos |
| PNG | 100% | Graphics with transparency |
| SVG | 100% | Icons, logos, illustrations |

Recommend WebP/AVIF over JPEG/PNG. Check for `<picture>` element with format fallbacks.

#### Recommended `<picture>` Element Pattern

Use progressive enhancement with the most efficient format first:

```html
<picture>
  <source srcset="image.avif" type="image/avif">
  <source srcset="image.webp" type="image/webp">
  <img src="image.jpg" alt="Descriptive alt text" width="800" height="600" loading="lazy" decoding="async">
</picture>
```

The browser will use the first supported format. Global browser support (caniuse.com, checked 2026-09-28): AVIF about 95.4%, WebP about 96.8%. Re-check caniuse before quoting.

#### JPEG XL: Emerging Format

The rest: https://github.com/AgriciDaniel/claude-seo/blob/HEAD/skills/seo-images/SKILL.md