Check Website HTTP Headers Online for Free
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About This Tool
The HTTP Header Checker fetches and displays the response headers for any web page — a vital tool for SEOs and developers verifying server configurations, cache-control settings, and security policies. it helps you identify misconfigurations that could affect performance. This tool is free, private, and executes all lookups in real time.
How to Use
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Enter the full URL you want to inspect (including https://).
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Click Check Headers — all response headers appear with their values listed.
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Review headers for cache settings
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security flags
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or missing CORS configuration.
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Enter the full URL of the website you want to check.
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Click the Check Headers button to perform a real-time request.
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Review the Status Code and list of headers returned by the server.
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Why are HTTP headers important?
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Headers control how browsers interact with your site, including caching behavior, security restrictions, and content types.
Frequently Asked Questions
What security HTTP headers should every website have?
Key security headers include Strict-Transport-Security, X-Content-Type-Options, X-Frame-Options, Content-Security-Policy, and Referrer-Policy.
Can I check headers on authenticated endpoints?
The tool sends unauthenticated GET requests. Endpoints requiring auth headers or cookies will return 401 or 403 status codes.
Is this HTTP header checker free?
Yes. Completely free with no account required.
Why are HTTP headers important?
Headers control how browsers interact with your site, including caching behavior, security restrictions, and content types.