Managed CDN
How Cache Rocket delivers cloud-optimized CSS/static assets on assets.cacherocket.com and WordPress images on img.cacherocket.com/wp/.
8 min read
Managed CDN is Cache Rocket’s own edge delivery. WordPress cloud images (optimization and LQIP) are served from https://img.cacherocket.com/wp/…. Critical CSS and optional Next.js /_next/static stay on https://assets.cacherocket.com.
You do not add assets.cacherocket.com or img.cacherocket.com as custom CDN hostnames. The WordPress plugin rewrites eligible URLs automatically when those Media features are enabled and your plan includes Managed CDN.
Two different CDN stories
Managed CDN delivers Cache Rocket-optimized assets. [CDN integrations](/documentation/cdn-integrations) connect *your* Cloudflare, Bunny, Fastly, or KeyCDN account to purge and rewarm HTML/page URLs. Both require the Managed CDN / CDN entitlement on paid plans, but they solve different problems.
What it delivers
- Optimized images — WebP/AVIF (plan-dependent) after cloud image jobs, on
img.cacherocket.com/wp/…. See Image optimization. - Critical CSS — generated
critical.cssfiles onassets.cacherocket.com, injected by the WordPress plugin. See Critical CSS. - LQIP placeholders — tiny blurred previews (inline and/or CDN under
img.…/wp/…). See LQIP.
Bandwidth and plans
Managed CDN egress is metered as CDN bandwidth (GB / month) on your subscription. Optimized variants and backups also count toward optimized image storage (GB). Starter, Pro, and Business include increasing allowances. When bandwidth or storage is exhausted, new CDN-backed optimization work hard-stops until the quota resets, storage is freed, or you upgrade. See Plans and limits.
| Plan signal | Meaning |
|---|---|
| Managed CDN entitlement | Cloud asset delivery and related CDN features are available. |
| CDN bandwidth GB / month | How much optimized-asset egress you may use this period. |
| Optimized image storage GB | How much retained optimized image (and backup) data you may keep. |
| CDN purges / day | Daily budget for BYO CDN purge → rewarm actions. |
Cleanup when you disable a feature
In the WordPress plugin, disabling a cloud Media feature deletes that site’s related objects from Cache Rocket CDN storage and attempts an edge purge. That keeps unused assets from lingering after you turn a feature off.
Custom CDN hostnames
Optional custom CDN rewriting (your own hostnames under Advanced) is separate. Do not list assets.cacherocket.com or img.cacherocket.com there—they are configured automatically for cloud assets. Use custom hostnames when you already serve static files from Cloudflare, Bunny, or another provider.
Common questions
- Is Managed CDN available on Free?
- WordPress Managed CDN (images on
img.cacherocket.com/wp/, Critical CSS onassets.cacherocket.com) starts on WordPress Starter and SaaS Starter. Free includes a small Next.js image CDN trial via@cacherocket/next(img.cacherocket.com/i/…) — see Next.js. - Do I need my own CDN or object-storage accounts?
- No. Cache Rocket operates storage and edge for Managed CDN and the Next.js image CDN. You only need a Cache Rocket plan with the matching entitlement.
- Can I use image CDN without WordPress?
- Yes. Install @cacherocket/next for
next/imagedelivery onimg.cacherocket.com/i/…. WordPress cloud images use the plugin andimg.cacherocket.com/wp/…; Critical CSS stays onassets.cacherocket.com.