Tor prevents eavesdroppers from learning sites that you visit. However, information sent unencrypted over the internet using plain HTTP can still be intercepted by exit relay operators or anyone observing the traffic between your exit relay and your destination website. If the site you are visiting uses HTTPS, then the traffic leaving your exit relay will be encrypted, and won't be visible to eavesdroppers.

The following visualization shows what information is visible to eavesdroppers with and without Tor Browser and HTTPS encryption:

• Click the “Tor” button to see what data is visible to observers when you're using Tor. The button will turn green to indicate that Tor is on.
• Click the “HTTPS” button to see what data is visible to observers when you're using HTTPS. The button will turn green to indicate that HTTPS is on.
• When both buttons are green, you see the data that is visible to observers when you are using both tools.
• When both buttons are grey, you see the data that is visible to observers when you don't use either tool.

HTTPS
Tor

POTENTIALLY VISIBLE DATA

Site.com

The site being visited.

user / pw

Username and password used for authentication.

data

Data being transmitted.

location

Network location of the computer used to visit the website (the public IP address).

Tor

Whether or not Tor is being used.