Use when reviewing image assets, markup, and CDN or build transforms related to Serve images from a CDN. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.
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---
name: image-cdn
description: "Use when reviewing image assets, markup, and CDN or build transforms related to Serve images from a CDN. Check encoded size, rendered size, loading strategy, and above-the-fold impact together."
metadata:
category: images
priority: high
difficulty: intermediate
estimatedTime: "30"
source: frontendchecklist.io
url: https://frontendchecklist.io/rules/images/image-cdn
---
# Serve images from a CDN
Image CDNs automatically optimize, resize, and convert images on-the-fly—delivering the smallest file in the best format without manual processing.
## Quick Reference
- Use image CDN for automatic format conversion (WebP, AVIF)
- Generate responsive sizes on-the-fly via URL parameters
- CDN edge caching delivers images from nearest location
- Popular options: Cloudinary, Imgix, Cloudflare Images, Vercel
## Check
Verify if images are served from a CDN or image optimization service.
## Fix
Configure an image CDN like Cloudinary, Imgix, or Cloudflare Images for automatic optimization.
## Explain
Explain how image CDNs provide on-the-fly optimization, resizing, and format conversion.
## Code Review
Review image assets, markup, and delivery configuration related to Serve images from a CDN. Flag exact files or components where format choice, sizing, or loading behavior violates the rule, and describe how to confirm the fix in DevTools.
---
For full implementation details, code examples, and framework-specific guidance,
see `references/rule.md`.
Rule page: https://frontendchecklist.io/rules/images/image-cdn
