HTTP Headers Viewer
See exactly what information your browser sends to websites with every request, including User-Agent, language preferences, and more.
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Common HTTP Headers
User-Agent
Browser name, version, and operating system
Accept-Language
Your preferred language(s) for content
Referer
The page you came from (can reveal browsing history)
DNT (Do Not Track)
Your tracking preference (often ignored by websites)
Privacy Implications
HTTP headers reveal a surprising amount about you. Your User-Agent alone can narrow down your device to a small group of users. Combined with language preferences and other headers, websites can often uniquely identify you.
Headers marked with "Privacy Risk" are particularly identifying. The Referer header is especially concerning as it reveals which site you were previously visiting.
Frequently Asked Questions
What are HTTP headers?
HTTP headers are key-value pairs sent with every web request and response. They carry metadata about the request, such as the content type, caching preferences, authentication tokens, and information about your browser.
Can websites see all my headers?
Yes, websites receive all HTTP headers your browser sends. This includes your User-Agent (browser info), Accept-Language (preferred languages), and potentially sensitive information like cookies and authentication tokens.
How can headers be used for tracking?
Headers like User-Agent, Accept-Language, and Accept-Encoding create a partial fingerprint. Combined with other data, they help identify unique visitors. Some headers like Referer also reveal your browsing history.
Can I modify or hide HTTP headers?
Browser extensions can modify some headers. Privacy browsers like Tor standardize headers to reduce fingerprinting. However, completely hiding headers would break most websites.