When browsing an Onion Service, Tor Browser displays different onion icons in the address bar indicating the security of the current webpage.

Image of a green onion A green onion means:

  • The Onion Service is served over HTTP, or HTTPS with a self-signed certificate.

Image of a green onion with a lock A green onion with a lock means:

  • The Onion Service is served over HTTPS with a CA-Issued certificate.

Image of a grey onion with a red slash A grey onion with a red slash means:

  • The Onion Service is served over HTTPS with a self-signed or CA-Issued certificate.
  • The webpage contains subresources served over HTTP.