Free HTTP Header Checker
Enter a URL to see its HTTP response headers, with checks on HTTPS, caching, compression, X-Robots-Tag and key security headers.
Checks the live page · free, no sign-up
How to use the free HTTP header checker
- 01
Enter a URL.
- 02
Review the status, response time and headers.
- 03
Fix missing caching, compression or a stray X-Robots-Tag.
Headers that affect SEO
HTTP headers are instructions the server sends with every page. A few matter directly for SEO: the status code, X-Robots-Tag (which can noindex a page invisibly), Link canonical headers, and caching and compression, which affect speed.
Security headers like Strict-Transport-Security don't change rankings, but they protect visitors and are a sign of a well-maintained site.
Tips for using the HTTP header checker
Look for X-Robots-Tag
A noindex in the header hides pages from Google without anything showing in the HTML.
Turn on compression
gzip or Brotli shrinks pages dramatically. Most hosts can enable it in one setting.
Cache static files
Long cache-control on images, CSS and JS speeds up repeat visits.
Check redirects
See every hop on the way with the redirect checker.
Skip the manual work: get an article published to your site every day.
Rankfly finds the keywords your site can actually win, writes a full SEO article for each one, adds images, and publishes it to WordPress, Shopify, Webflow, Wix and more. Enter your website to see your free 30-day content plan.
3-day free trial · $66/month for 30 articles
HTTP Header Checker FAQ
What's X-Robots-Tag?
A header version of the meta robots tag. It can noindex any file, including PDFs and images, and is easy to miss because it isn't in the page's HTML.
Does it follow redirects?
Yes. It shows headers from the final URL and counts the redirects on the way.
Is it free?
Yes, with no sign-up. Checks are limited to 60 a day per person.
What are HTTP headers?
Information the server sends with every response: status, content type, caching rules and more.
Which headers matter for SEO?
Status code, X-Robots-Tag, Link (canonical), Content-Type, and caching/compression for speed.
What is HSTS?
Strict-Transport-Security tells browsers to always use HTTPS for your site.
Related free SEO tools
All 87 free toolsCanonical Tag Checker
Enter a URL to check its canonical tag: whether it exists, points to itself, is the only one, and points to a working page.
Broken Link Checker
Enter a URL to test every link on the page and find the broken ones (404s and errors) and the ones that redirect.
Robots.txt Checker
Enter a URL to fetch the site's robots.txt, check it for errors, and see whether Googlebot, Bingbot and AI crawlers like GPTBot may crawl that URL.
Robots.txt Generator
Create a correct robots.txt: choose what to block, add your sitemap, and decide how to treat AI crawlers like GPTBot and ClaudeBot.
XML Sitemap Validator
Enter a sitemap URL (or just your domain) to validate its structure, URLs and lastmod dates, and check that the first pages listed actually load.
Noindex Checker
Enter a URL to find out whether Google can index it: meta robots, X-Robots-Tag header, robots.txt, status code and canonical, all in one check.
All free technical seo tools
Let Rankfly do your SEO for you.
Enter your website for a free 30-day content plan: the keywords your site can win and the articles Rankfly would write and publish. About three minutes.
3-day free trial · $66/month after · Cancel anytime