Performance

HTTP Headers Checker

Enter any URL and we'll show every HTTP response header it returns — including caching directives, security headers, server info, and any custom debugging headers.

What is an HTTP headers checker?

An HTTP headers checkerrequests any URL and shows every response header the server returns. It's an http header test and header checker in one — paste a URL to check server headers in seconds, no signup.

Check response & security headers

Use it as a security headers check: confirm HSTS, Content-Security-Policy, X-Content-Type-Options, X-Frame-Options and more are present. It's the fastest header checker online for an http https header check and a quick web header check before you ship.

Why HTTP headers matter

Headers control caching, compression, security and how crawlers treat your pages. Correct headers mean faster repeat visits, safer browsing, and cleaner indexing — all of which support performance and SEO.

How to use the HTTP headers checker

  1. Paste a URL into the HTTP headers checker above.
  2. Click “Check” — we request the page and read its headers.
  3. Review caching, security, server and content-type headers.
  4. Add any missing security headers, then re-check.

Audit the rest of your site

Pair this with our URL Status Code Checker, Page Speed Test, Robots.txt Checker and the full free SEO tools suite.

Frequently asked questions

An HTTP headers checker is a free tool that requests any URL and shows every HTTP response header the server returns — caching directives, security headers, content-type, server info and custom headers. It's a fast HTTP header test / header checker, no signup.
Paste the URL into the HTTP headers checker above and run it. We make the request and list the full set of response headers exactly as the server sends them — the quickest way to check server headers online.
Security headers tell the browser how to protect your site — Strict-Transport-Security (HSTS), Content-Security-Policy, X-Content-Type-Options, X-Frame-Options, Referrer-Policy and Permissions-Policy. This security headers check shows which are present so you can spot missing protections.
Headers control caching (faster repeat visits), compression, security, and how crawlers treat your pages (e.g. X-Robots-Tag). Correct headers improve speed, safety and indexing — all of which support SEO.
Completely free and online, with no account required. It's part of WebsiteAuditTools' free suite of technical SEO and performance tools.