HTTP Header Checker
Last updated: June 20, 2026Inspect any URL's response headers.
HTTP Header Checker is a free online tool to inspect any URL's response headers. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.
How to use HTTP Header Checker
This HTTP header checker fetches any URL server-side and shows its full response headers and status code, with the SEO and security-relevant ones — X-Robots-Tag, canonical Link, cache-control, content-type, compression and HSTS — flagged at the top. Browsers hide most cross-origin headers, so a server-side check reveals what they cannot. Free, no sign-up.
- 1Enter the URL you want to inspect.
- 2Read the status code and the full list of response headers.
- 3Check the flagged SEO and security headers for misconfigurations.
Free to use
No watermarks and no forced sign-up. Free credits to get started.
Private by design
Runs in your browser — your files never leave your device.
Fast & simple
A clean interface, instant results, and it works on any device.
Check caching and compression
Headers like cache-control and content-encoding decide whether browsers and CDNs cache your page and serve it compressed, both of which affect speed. The checker surfaces them so you can confirm static assets are cached aggressively and HTML is gzipped or brotli-compressed.
Find a noindex hidden in a header
A page can be blocked from search by an X-Robots-Tag HTTP header even when the HTML looks fine, which is easy to miss. This tool flags that header explicitly, so you can catch an accidental noindex that is quietly keeping a page out of Google.
Debug status codes and server config
See the exact status code and server headers a URL returns — useful for confirming a page really returns 200, spotting an unexpected 404 or 500, or checking which server and security headers are in place.
HTTP Header Checker — frequently asked questions
Which HTTP headers matter for SEO?
The most important are X-Robots-Tag (indexing rules), the canonical Link header, cache-control and content-encoding (speed), and content-type. The checker highlights these above the full header list.
Why check headers instead of just the page?
Some directives, like a noindex in X-Robots-Tag or a canonical in a Link header, live only in the HTTP response, not the HTML. You cannot see them by viewing source, so a header check is the only way to catch them.
Can it show headers my browser hides?
Yes. Because the request is made server-side, it can read cross-origin response headers that browser security would normally block from client-side scripts.
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