image-seo
Installation
SKILL.md
Image SEO
Quick Reference
| Area | Action |
|---|---|
| Format | AVIF > WebP > JPEG via <picture> |
| LCP image | fetchpriority="high" + <link rel="preload"> + NEVER lazy-load |
| Below-fold | loading="lazy" on all images outside viewport |
| Alt text | Under 125 chars, specific, contextual |
| Dimensions | Always set width and height (prevents CLS) |
| Responsive | 4-6 srcset breakpoints, use w descriptors |
| Compression | JPEG 75-85, WebP 70-80, AVIF 45-60 quality |
| Heroes | Target <200KB; product <150KB; OG 1200×630 <300KB |
| Image sitemap | Required for JS-heavy or large e-commerce sites |
| Visual search | Original photos, clear subjects, Product schema |