HTTP Header Check
Every request your browser makes carries headers describing what it is and what it accepts. This page shows the signals readable from the client side — the same facts sites use for content negotiation and analytics.
Collecting…
Which headers do websites actually receive?
The full set includes User-Agent, Accept-Language, encoding support, cookies, and increasingly structured client hints. Reading the complete server-side list requires a server; this page shows the client-visible signals, which cover the identifying ones.
Can I change these headers?
Your language list follows browser settings, and extensions can override the user agent. Keep in mind that unusual header combinations make you more fingerprintable, not less.
This tool also lives in the homepage tool drawer alongside 17 others. Browse everything on the tools page or look up any address with the IP lookup.