Free HTTP Headers Checker - View Request Headers Your Browser Sends

View all HTTP request headers your browser sends to websites. See User-Agent, Accept-Language, cookies, and other headers that reveal your information.

What Is HTTP Headers Checker?

An HTTP headers checker displays all the headers your browser sends with every HTTP request. These headers include your User-Agent (browser and OS information), Accept-Language (preferred languages), cookies, referrer, and other metadata that websites use to identify and serve you.

How to Use

Visit this page to instantly see all HTTP headers your browser is sending. The tool captures and displays every header from your current request, along with explanations of what each header reveals about you.

Use Cases

See what information your browser exposes to websites
Debug API requests and response headers
Verify privacy settings are working correctly
Check if proxy or VPN is adding identifying headers
Test custom User-Agent strings

Frequently Asked Questions

What are HTTP headers?

HTTP headers are metadata sent between your browser and web servers with every request and response. They contain information about the browser, accepted content types, caching preferences, authentication tokens, and more.

Can HTTP headers track me?

Yes. Headers like User-Agent, Accept-Language, and Accept-Encoding create a partial fingerprint. Combined with other browser characteristics, headers can contribute to browser fingerprinting and tracking across websites.

What is the User-Agent header?

The User-Agent header identifies your browser name, version, rendering engine, and operating system. For example: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/125.0.0.0". Websites use it to serve compatible content.