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ToolNest AI
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HTTP Header Checker

Analyze HTTP response headers, security headers and caching configuration for any website.

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Analyze HTTP Headers

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Enter a URL above and click Analyze

Fetches all HTTP response headers server-side and checks security headers, caching, compression, SEO headers and cookies.

Security HeadersCache-ControlBrotli / GzipX-Robots-TagCookiesSEO Score

About HTTP Header Checker

Enter any URL and instantly inspect every HTTP response header — status code, server, content type, all security headers (HSTS, CSP, X-Frame-Options, Referrer-Policy and more), caching directives (Cache-Control, ETag, Expires), compression (Brotli, Gzip), SEO headers (X-Robots-Tag, Link canonical, Vary, Content-Language) and cookie flags. An overall score (0–100) highlights missing or misconfigured headers with specific, actionable recommendations. Export the full report as CSV, JSON, TXT or PDF.

Frequently Asked Questions

HTTP headers are key-value pairs sent between a web server and browser (or crawler) with every request and response. They carry metadata about the content — its type, length, encoding — along with caching directives, security policies, cookie instructions and more. They are invisible to end users but critical for browsers, crawlers and security tools.

The highest-impact security headers are: Strict-Transport-Security (forces HTTPS), Content-Security-Policy (prevents XSS), X-Content-Type-Options: nosniff (prevents MIME sniffing), X-Frame-Options (prevents clickjacking) and Referrer-Policy (controls referrer data leakage). Missing any of these is flagged by security audits.

Several headers directly affect SEO. The X-Robots-Tag header can block or allow indexing, equivalent to the meta robots tag. The Link header can declare a canonical URL at the HTTP level. Cache-Control and compression headers affect page speed, which is a Google ranking factor. A missing or incorrect Content-Type can cause crawl issues.

Proper caching (Cache-Control, ETag, Last-Modified) reduces server load, speeds up repeat visits and improves Core Web Vitals scores. Pages that load faster get better rankings. Missing cache headers mean every visit re-fetches all resources, wasting bandwidth and increasing load times.

Yes, 100% free with no account required and no usage limits.

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