seo-images
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".
npx skills add Infrasity-Labs/dev-gtm-claude-skills --skill seo-images --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# 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 |
- Checks
- Alt Text
- File Size
- Format
- Responsive Images
- Lazy Loading
- fetchpriority="high" for LCP Images
- decoding="async" for Non-LCP Images
- CLS Prevention
- File Names
- CDN Usage
- Output
- Image Audit Summary
- Prioritized Optimization List
WebP (recommended default) - with metadata preserved cwebp -q 82 -metadata all input.jpg -o output.webp WebP via ImageMagick (fallback if cwebp not installed) convert input.jpg -quality 82 output.webp AVIF via FFmpeg (slower encode, best compression) ffmpeg -i input.jpg -c:v libaom-av1 -crf 30 -still-picture 1 output.avif Responsive variants (400w, 800w, 1200w) convert input.jpg -resize 400x -quality 82 image-400.webp convert input.jpg -resize 800x -quality 82 image-800.webp convert input.jpg -resize 1200x -quality 82 image-1200.webp
What does the seo-images skill do?
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".
How do I install it?
Run `npx skills add Infrasity-Labs/dev-gtm-claude-skills --skill seo-images --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From Infrasity-Labs/dev-gtm-claude-skills, a repository with 97 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.