Onion-Location and the meta redirect

Onion-Location is a small standard that lets a site advertise its onion address to a Tor Browser visitor. When Tor Browser sees the header, it shows a purple ".onion available" button in the address bar, and if the user has opted in, it navigates there automatically.

Where you will see it

The clearnet discovery pages for Zion advertise the current primary onion through both an HTTP Onion-Location response header and an equivalent <meta http-equiv="onion-location"> tag as a fallback for setups that strip headers. Both point at a verified address from the list on this site, so following the prompt lands you on a real node.

Why this is not a phishing vector, when done right

A redirect is only as trustworthy as its destination. Because our Onion-Location target is always one of the addresses published and signed here, the redirect cannot quietly send you to a clone. The moment you arrive, the same two checks apply: the login header echo and, if in doubt, the signed list. Treat the redirect as a convenience, not as a substitute for verification.

Last reviewed 2026-06-30.