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image-optimization

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Use when reviewing image assets, markup, and CDN or build transforms related to Optimize all images for web. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.

skills/image-optimization/SKILL.md

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# Optimize all images for web

Images typically account for 50%+ of page weight. Unoptimized images cause slow load times, wasted bandwidth, poor Core Web Vitals scores, and frustrated users—especially on mobile networks.

## Quick Reference

- Use modern formats: AVIF > WebP > JPEG/PNG
- Compress images to 80% quality for photos
- Always provide responsive srcset for different screen sizes
- Use `<picture>` element for format fallbacks

## Check

Scan this codebase for all image assets and <img> elements. For each image, verify: 1) Format is appropriate (WebP/AVIF for photos, SVG for icons, PNG only for transparency). 2) Responsive srcset and sizes attributes exist for images > 100px wide. 3) width/height attributes are present to prevent layout shift. 4) loading='lazy' is set for below-fold images. 5) File sizes are reasonable (< 200KB for photos, < 50KB for graphics). Report issues grouped by severity with file paths.
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