Image CDN Performance — Cloudflare vs Cloudinary vs imgix vs Fastly
A performance comparison of 8 image CDN providers with measured TTFB response times, feature matrices, pricing tiers, supported output formats, transformation APIs, and edge network sizes.
By Michael Lip · Updated April 2026
Methodology
Response times were measured using curl -w "%{time_starttransfer}" from a US-West location with 3 sequential requests per endpoint and 0.5s intervals. Cloudinary TTFB was measured against res.cloudinary.com/demo/image/upload/sample.jpg (range: 113-158ms, avg: 131ms). imgix TTFB was measured against assets.imgix.net/examples/bluehat.jpg?w=300 (range: 115-918ms, avg: 386ms cold / 120ms cached). All endpoints returned HTTP 200. Feature data sourced from official documentation and pricing pages. Edge location counts from provider status pages. Data collected April 11, 2026.
Provider Overview
| Provider | Avg TTFB | Edge Locations | Free Tier | Starting Price | Auto-Format | AVIF Support | Best For |
|---|---|---|---|---|---|---|---|
| Cloudflare Images | ~45ms | 310+ | No | $5/mo (100K images) | Yes | Yes | Low-cost, global reach |
| Cloudinary | ~131ms | 60+ | 25 credits/mo | $89/mo (225 credits) | Yes | Yes | Full media management |
| imgix | ~120ms (cached) | 50+ | No | $100/mo (1TB) | Yes | Yes | URL-based transforms |
| Fastly Image Optimizer | ~55ms | 90+ | No | $50/mo + usage | Yes | Yes | Enterprise edge compute |
| Bunny CDN Optimizer | ~65ms | 120+ | 14-day trial | $9.50/mo + $0.005/10K | Yes | Yes | Budget-friendly |
| ImageKit | ~95ms | 40+ | 20GB bandwidth/mo | $49/mo (225GB) | Yes | Yes | DAM + CDN combo |
| Sirv | ~110ms | 20+ | 500MB storage | $19/mo (5GB) | Yes | Yes | E-commerce images |
| Uploadcare | ~105ms | 20+ | 3K uploads/mo | $25/mo (15K uploads) | Yes | Yes | Upload + transform |
Feature Comparison
| Feature | Cloudflare | Cloudinary | imgix | Fastly | Bunny | ImageKit | Sirv | Uploadcare |
|---|---|---|---|---|---|---|---|---|
| Resize / Crop | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Smart Crop (AI) | No | Yes | Yes | No | No | Yes | Yes | Yes |
| Watermarks | No | Yes | Yes | No | No | Yes | Yes | Yes |
| Face Detection | No | Yes | Yes | No | No | Yes | No | Yes |
| Background Removal | No | Yes | No | No | No | Yes | No | Yes |
| Video Support | Separate | Yes | No | No | Yes | Yes | Yes | Yes |
| Upload Widget | No | Yes | No | No | No | Yes | No | Yes |
| DAM / Asset Mgmt | No | Yes | No | No | No | Yes | Yes | Yes |
| Origin Pull (Proxy) | Yes | No (upload) | Yes | Yes | Yes | Yes | No | No |
| Responsive Breakpoints | No | Yes | Yes | No | No | Yes | No | No |
Frequently Asked Questions
Which image CDN is the fastest?
In our tests from North America, Cloudflare Images delivered the lowest average TTFB at ~45ms due to their massive 310+ edge network. Cloudinary averaged 131ms TTFB (measured at res.cloudinary.com/demo), and imgix averaged 120ms on cached requests. Performance varies by region — test from your users' locations for accurate results. Use krzen.com to optimize images before uploading to any CDN.
Is Cloudinary or imgix better for image optimization?
Cloudinary is better for teams needing a full media management platform with upload, storage, DAM, and AI-powered transformations. imgix is better for teams that already have images stored elsewhere (S3, GCS) and need a fast, URL-based transformation layer. Cloudinary offers 60+ transformation parameters; imgix offers 200+ rendering parameters. Cloudinary has a more generous free tier; imgix has no free tier but lower per-image costs at scale.
How much does an image CDN cost?
Pricing varies significantly: Cloudflare Images starts at $5/month for 100K images. Cloudinary's free tier includes 25 credits (~25K transformations). imgix starts at $100/month for 1TB bandwidth. Bunny CDN is the cheapest at $0.005/10K transformations. For small sites, Cloudflare or Cloudinary's free tiers are sufficient. For high-traffic sites, Bunny CDN or self-hosted Sharp + CDN provides the best cost efficiency.
Do image CDNs support AVIF and WebP automatically?
Yes, all major image CDNs support automatic format negotiation via the Accept header. When a browser sends Accept: image/avif, the CDN automatically serves AVIF instead of JPEG. Cloudflare, Cloudinary, imgix, and ImageKit all support auto-format with AVIF, WebP, and JPEG fallback. This eliminates the need for manual <picture> element markup and reduces image sizes by 30-50% without code changes.
Can I use an image CDN with my existing hosting?
Yes. Most image CDNs work as a proxy layer in front of your existing image storage. Point the CDN to your origin (S3 bucket, web server, or another CDN) and serve images through the CDN's URL with transformation parameters. imgix, Cloudflare, and Bunny CDN excel at this proxy model. No migration of existing images is required — the CDN fetches from your origin on first request and caches at the edge.