HTTP Headers Viewer
See what information your browser exposes to every website you visit. View your browser's request headers and inspect response headers from any URL.
Inspect Response Headers from a URL
How HTTP Headers Viewer Works
Discover what HTTP headers your browser sends and receives. View User-Agent, Accept-Language, cookies, DNT, and response headers from any URL. and. Use the tool above to get your results instantly — everything runs in your browser with no data sent to any server.
What Are HTTP Headers?
HTTP headers are metadata sent between your browser and web servers with every request and response. Request headers tell the server about your browser, language preferences, accepted content types, and more. Response headers tell your browser about caching, security policies, content type, and server configuration. Headers are invisible during normal browsing but reveal significant information about you.
Common Request Headers Explained
- User-Agent — Identifies your browser, version, and operating system. Used for compatibility but also for fingerprinting.
- Accept-Language — Your preferred languages. Reveals your location and nationality.
- DNT (Do Not Track) — A signal requesting websites not track you. Not all websites honor this.
- Connection Type — Your network connection type (WiFi, 4G, etc.). Available via the Network Information API.
- Cookies Enabled — Whether your browser accepts cookies. Cookies are the primary tracking mechanism on the web.
- Referrer Policy — Controls what URL information is sent when you click links.
Common Response Headers
Response headers sent by web servers include security headers (Content-Security-Policy, Strict-Transport-Security, X-Frame-Options), caching headers (Cache-Control, ETag, Expires), content headers (Content-Type, Content-Length), and server identification (Server, X-Powered-By). Missing security headers can indicate a poorly configured server.
Why Should You Care About HTTP Headers?
- Headers expose your browser, OS, language, and connection type to every website
- Combining headers creates a semi-unique profile for fingerprinting
- Missing security response headers leave you vulnerable to attacks
- Understanding headers helps you make informed privacy decisions
- Developers use headers for debugging, caching optimization, and security hardening
Getting the Most from This Tool
Start by exploring the default settings to understand what the tool offers, then customize the inputs to match your specific needs. Use the results as a starting point for deeper analysis or decision-making. Bookmark this page for quick access in the future. All processing happens in your browser, so your data stays private and the tool works even without an internet connection after the initial page load.