Audit & Analysis · Free tool

HTTP Header & Security Header Checker

Free HTTP header checker: inspect response headers of any URL and grade security headers like HSTS, CSP, X-Frame-Options and Referrer-Policy.

Step by step

How to use the HTTP Header & Security Checker

01Enter the url
02Click "Run HTTP Header & Security Checker" — it's free and instant
03Review your results on screen and download the PDF/Excel report

What is the HTTP Header & Security Checker?

Every web response carries HTTP headers — status, content type, caching rules, compression, cookies and security policies. This tool requests any URL, lists every response header and grades the important security headers: Strict-Transport-Security (HSTS), Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy.

Why it matters for SEO

Headers decide how browsers and crawlers treat your site. Missing security headers leave visitors exposed to clickjacking and content-injection attacks; wrong caching headers make pages slow; a stray X-Robots-Tag: noindex silently removes pages from search. Checking headers is a quick way to catch all three.

How to read your HTTP Header & Security Checker results

Green security headers are set correctly; red ones are missing. HSTS and X-Content-Type-Options are simple to add on almost any server. Also look at Cache-Control on static files — “no-store” on CSS and JavaScript forces every visit to download them again and slows the site.

Expert tips

Add HSTS only after HTTPS works everywhere on the domain.
Start Content-Security-Policy in report-only mode to avoid breaking scripts.
Give static assets long cache lifetimes with versioned file names.
Confirm there is no unintended X-Robots-Tag header.

Limitations

Checks only the single URL you enter, as our server fetches it. It does not crawl the whole site, run JavaScript, or see pages behind a login.

Why use our HTTP Header & Security Checker?

Completely free — use HTTP Header & Security Checker as many times as you want
No login or registration needed to see results
Download the report as PDF or Excel with a free account
Works on any device — desktop, tablet or mobile

Frequently asked questions

HTTP response headers that instruct browsers to enable protections, such as forcing HTTPS (HSTS) or blocking the page from being framed (X-Frame-Options).

Indirectly. Caching and compression headers affect speed, X-Robots-Tag controls indexing, and HTTPS/HSTS are trust signals.

Strict-Transport-Security tells browsers to always use HTTPS for your domain, preventing downgrade attacks.

Content-Security-Policy is not set by default on most servers. It must be configured deliberately for your scripts and styles.

Yes. HTTP Header & Security Checker is 100% free with unlimited usage. You can run it as often as you like without paying anything.

No login is required to use HTTP Header & Security Checker and see your results. You only need a free account if you want to download reports as PDF/Excel or save your history.