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image-file-size

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Use when auditing the image pipeline, static assets in `public/`, CMS-managed media, or image CDN transforms. Separate file-size problems from dimension mismatches so you can tell whether the issue is compression, format choice, or responsive delivery.

skills/image-file-size/SKILL.md

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Oct 31, 2026
License
MIT

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# Keep image file sizes within recommended limits

Images account for over 50% of average page weight according to HTTP Archive data. Oversized images waste user bandwidth (costly on mobile data plans), delay Largest Contentful Paint (LCP), and increase bounce rates. A 1-second delay in mobile page load can reduce conversions by up to 20% according to Google research.

## Quick Reference

- Photos: target under 200KB (WebP 80% quality); under 400KB for full-bleed hero images
- Graphics/icons: target under 50KB; use SVG for vector graphics
- WebP is typically 25-35% smaller than equivalent-quality JPEG (per web.dev)
- AVIF is typically 40-50% smaller than equivalent-quality JPEG (per web.dev)

## Check

Audit all image assets in this project. For each image: 1) Check the file size in bytes. 2) Flag any photo (JPEG/WebP/AVIF) over 200KB. 3) Flag any graphic/icon (PNG/SVG) over 100KB. 4) Flag any hero or full-width image over 400KB. 5) Flag any thumbnail (under 200px wide) over 30KB. Also check if Lighthouse reports 'Properly size images' or 'Efficiently encode images' as opportunities. Report each oversized image with its path, current size, and an estimated target size.
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