If used as directed, the Guardian SecureDrop service allows you to share files with the Guardian confident of complete anonymity.
Encrypting the contents of an email using public key cryptographic methods is a good way to avoid compromising the content.
While the platform itself uses Tor hidden services to support anonymity, it is advisable to be careful where you access it from. You should avoid using the platform on small networks where use of Tor may be monitored or restricted, or in public places where your screen may be viewed by CCTV. We recommend that you don't jump straight from this landing page to the SecureDrop site, especially on business networks that may be monitored. Best practice would be to make a note of the Tor URL (see below) and then to upload your content from a different machine at a later time.