Free tool
What headers does your server send?
Enter an address and we request it once, then show the headers that came back and what each one does.
Headers are the instructions that travel with a page: how long it may be cached, what type of file it is, and sometimes whether search engines are allowed to index it at all. Most are invisible until one of them is wrong, at which point they can quietly undo a great deal of work.
Free, no account. We request the page once and show what the server sent back.
Questions people ask
- How do I check the HTTP headers of a website?
- Enter the address above. We make one request and show the headers that came back, with a short note on what each one controls. Your browser can show the same information in its developer tools under the Network tab.
- What is the x-robots-tag header?
- An instruction to search engines carried in the response rather than in the page. It can contain noindex, which hides the page from search results, and because it is invisible in the HTML it is a common cause of pages that disappear for no apparent reason.
- What does cache-control do?
- It tells browsers and networks how long they may keep a copy of the page before asking for it again. Generous caching makes a site feel much faster for returning visitors; no header at all leaves everyone guessing, usually conservatively.
- Which HTTP headers matter for SEO?
- Very few, but they matter a lot: the status code itself, content-type, x-robots-tag, and any redirect location. The rest, such as the security headers, matter for safety rather than for ranking.
- Why is my page not being indexed?
- If the page loads normally in a browser but never appears in search, an x-robots-tag or a robots meta tag containing noindex is the first thing to rule out, and this checker shows the header version.
Other free tools
- Redirect checkerFollow every hop an address passes through to its final destination.
- Robots.txt checkerSee whether your file is blocking Google, Bing or the AI assistants.