Response & redirects
Review status, final URL, content type, compression, and readable response timing.
FREE WEBSITE INSPECTION
Understand any website in a few seconds
Inspect HTTP headers, hosting and CDN signals, security policies, caching, redirects, technologies, and SEO metadata from one URL.
✓ No signup🔒 Public data onlyJSON Downloadable report▦ Mobile friendly
Enter a public website URL to begin the inspection.
Your complete website report will appear here
Enter one public URL above. The tool automatically organizes headers, server and CDN clues, security, caching, technology, and SEO details.
Website blocked automatic inspection? Analyze copied headers manually
Private report handling
QuickDeveloperTools does not save checked URLs, pasted headers, HTML, or downloaded reports.
Know the limits
This is a public website inspection, not a vulnerability scanner, port scanner, or full performance audit.
WEBSITE HEADER CHECKER GUIDE
What the report can help you understand
Response headers describe how a website delivers content, controls caching, protects browser behavior, and identifies parts of its delivery stack.
Delivery infrastructure
Look for Cloudflare, CloudFront, Vercel, Netlify, Fastly, Akamai, and Azure clues.
Security policies
Check HTTPS, HSTS, CSP, frame protection, MIME sniffing, referrer, and permissions policies.
Page metadata
Inspect title, description, canonical, robots, language, headings, Open Graph, and JSON-LD.
COMMON QUESTIONS
Website checker FAQ
What does a website header checker show?
It inspects readable HTTP response headers, status, redirects, caching, security policies, server and CDN clues, Cloudflare indicators, page metadata, technology signatures, and basic response timing.
Why can some website URLs not be inspected?
Browsers enforce Cross-Origin Resource Sharing rules. If the target website does not allow browser-based cross-origin access, the request or some response headers cannot be read. You can paste response headers and HTML into the manual analyzer instead.
How does the checker detect Cloudflare?
The checker looks for Cloudflare response indicators such as CF-Ray, CF-Cache-Status, and a Cloudflare server value. A visible CF-Ray header is treated as strong evidence that the request passed through Cloudflare.
Can this tool identify every server and website technology?
No. Servers can remove or change identifying headers, CDNs can hide origin details, and frameworks may leave no public signature. Technology results are best-effort detections and include only evidence visible to the browser.
Does QuickDeveloperTools store the URLs or headers I check?
No. Analysis runs in your browser. URL mode sends a direct request from your browser to the website you enter, so that website may receive your normal request information such as your IP address and browser headers.
What security headers does this tool review?
It reviews HTTPS, Strict-Transport-Security, Content-Security-Policy, X-Content-Type-Options, X-Frame-Options or frame-ancestors, Referrer-Policy, Permissions-Policy, and related visible response headers.
Suggested tools
