Cache Checker: Check Website Cache Headers
Cache checker that lets you check website cache headers instantly. Inspect Cache-Control, ETag, Last-Modified, and CDN cache status.
How to use the Cache Checker
- 1Paste any URL into the input.
- 2Click Check to fetch the response headers.
- 3Read the Cache-Control, ETag, and CDN-cache fields.
- 4Use the diagnosis to fix weak or missing caching.
What you can do with the Cache Checker
Check Cache-Control headers on a URL.
Verifies max-age, public/private, and immutable directives in seconds.
Check if a CDN is caching a page.
Reads x-cache, cf-cache-status, and similar headers to confirm hits vs. misses.
Diagnose 'not cached by CDN' issues.
Spots common causes: cookies on static URLs, missing Cache-Control, or vary headers blocking caching.
Confirm browser caching is working.
Validates that static assets have a sane max-age so repeat visitors load instantly.
Cache Checker FAQs
What is Cache-Control and why does it matter?+
Cache-Control tells browsers and CDNs how long to keep a response. A good policy makes repeat visits near-instant and offloads traffic from your origin.
What's a good max-age for static assets?+
One year (max-age=31536000, immutable) for hashed/versioned files. For HTML, use a short max-age or no-cache so updates show up quickly.
Is my URL stored?+
No. We make one read-only header request and discard everything after rendering the result.
Why does x-cache show MISS?+
Either the asset isn't in the edge cache yet, or your Cache-Control/cookies are telling the CDN not to cache it. Fix the headers and most CDNs start serving HITs.
Does cache checking work for any site?+
Most sites, yes. A few servers block cross-origin header reads — if so, test from a different network or check with curl.
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