Monitor All Network Activity
Discover everything that is happening on your computer. Expose every connection your applications make and detect evil ones. Finally get the power to act accordingly.

Auto-Block Trackers System-Wide
Protect your whole computer, not just your browser. Block all advertisements and trackers for every application. Easily add your own rules and block individual domains.

Set Global & per‑App Settings
Make your own rules. Completely cut off applications from the Internet. Or block all p2p connections except for certain apps. Or never connect to specific countries. Portmaster has you covered.

Secure Your DNS by Default
Even with invasive connections gone, you do not want to share your DNS requests out in the open. With Portmaster, all your DNS queries are automatically secured and re-routed to a DNS-over-TLS provider of your choice.

Explore the Docs and Source Code
In the age of Mass Surveillance, what good is a service when you cannot see what it is really doing? We believe in open source. We also document everything as good as we can.

Create Your Own Rules
Portmaster has great defaults — but one shoe does not fit all. Customize and configure Portmaster's powerful settings to fit your needs and threat model.

Set Global & per‑App Settings
Easily cut off applications from the Internet. Or block all p2p connections globally but allow them for certain apps. Or never connect to specific countries. Portmaster has you covered.