Cache-Control Builder

Build HTTP Cache-Control header directives interactively with live preview.

Directives

no-storeNever store any response — the strongest no-cache directive.no-cacheMust revalidate with the server before serving from cache.publicResponse may be stored by any cache (CDNs included).privateResponse is for a single user only — not for shared caches.must-revalidateOnce stale, must revalidate before serving.proxy-revalidateLike must-revalidate but for shared/proxy caches only.immutableContent will never change — skip revalidation during max-age.

max-age

s-maxage

stale-while-revalidate

stale-if-error

Live Preview

Full header line

Cache-Control: public, max-age=86400

Value only (for use in code)

public, max-age=86400

Example response snippet

HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8
Cache-Control: public, max-age=86400

Cache-Control Builder — generate HTTP cache directives interactively

The Cache-Control HTTP header controls how browsers, CDNs, and proxy caches store your responses. The most common directives are max-age (how long in seconds a cached response is fresh), no-store (never cache at all — for sensitive data), and no-cache (always revalidate before serving). Use public to allow CDN caching and private for user-specific responses. The immutable directive is ideal for content-hashed static assets — it prevents browsers from issuing conditional revalidation requests during the max-age window, giving you the fastest possible cache performance.

Private & free — this tool runs entirely in your browser.