What are HTTP headers and why do they matter?

HTTP headers are metadata sent between web browsers and servers with every request and response. They control caching, security, content type, authentication, and more. Properly configured headers are essential for website security and performance.

How does the security scoring work?

The security score checks for essential security headers like Strict-Transport-Security (HSTS), Content-Security-Policy (CSP), X-Content-Type-Options, X-Frame-Options, Referrer-Policy, and Permissions-Policy. Each header is scored based on its presence and configuration quality, with a final grade from A to F.

Can this tool check any website's headers?

Yes, you can inspect the HTTP headers of any publicly accessible website. The tool fetches the URL from our server and displays all response headers with explanations. Private or internal network addresses cannot be inspected for security reasons.

Is this HTTP header checker really free?

Yes, this tool is completely free with no signup, no account, and no usage limits beyond basic rate limiting. Your inspection history is stored locally in your browser and never sent to our servers.

What is the difference between HTTP request and response headers?

Request headers are sent by the browser to the server (like User-Agent, Accept, Cookie), telling the server about the client and what it wants. Response headers are sent back by the server (like Content-Type, Cache-Control, Set-Cookie), telling the browser how to handle the response. This tool primarily inspects response headers.

Free Online HTTP Header Inspector & Analyzer (No Signup) – FreeWWW

HTTP Header Inspector

Analyze response headers, check security & performance scores, inspect redirects, and understand every header

How to Use This Tool

Enter a URL — Type or paste any website URL into the input bar at the top.
Choose an HTTP method — Select GET, HEAD, POST, or another method from the dropdown.
Click Inspect — The tool fetches the URL and displays all response headers with security and performance scores.
Explore header details — Click any header row to see an explanation of what it does and how to configure it.
Compare URLs — Use the Compare tab to see header differences between two websites side by side.

Common Use Cases

How do I check if my site has proper security headers? Enter your URL and review the security score breakdown to see which headers like HSTS, CSP, and X-Frame-Options are missing.
How do I debug redirect chains and loops? Inspect a URL that redirects and the tool will show the full redirect chain with each hop's status code and headers.
How do I verify my caching headers are set correctly? Check the performance score and look for Cache-Control, ETag, and Expires headers in the response.

Enter any URL above and click Inspect to fetch and analyze its HTTP response headers. You will see a security and performance audit, header explanations, redirect chain, timing breakdown, and more.

Compare HTTP Headers

Enter two URLs to compare their response headers side by side. Differences are highlighted.

Custom Request Builder

Build a custom HTTP request with your own headers and method.

URL

Custom Headers

Inspection History

Privacy: URLs you inspect are fetched by our server only to read their HTTP headers; we don't store them. Your inspection history and preferences are saved locally in your browser and never sent to us.