Resist Network Surveillance

Portmaster is a free and open-source application firewall. Monitor every network connection on your computer and set per-application rules for what to block.

Version: V2
Github Stars:
Portmaster

Monitor All Network Activity

See every network connection your applications make in real time. Identify unexpected or unwanted connections and block them individually or by rule.

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Block Trackers System-Wide

Block ads and trackers at the DNS level across all applications, not just your browser. Add custom rules or block specific domains as needed.

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Set Global & per‑App Settings

Make your own rules. Completely cut off applications from the internet, block specific connection types, or restrict connections to certain countries per app or globally.

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Blog, Podcast & Videos

Blogs Podcast Videos
Portmaster Pro price drop: €80/year starting today
Viktor
BLOG - 24. Feb 2026
Portmaster Development Roadmap: 2025 Survey Results
Viktor
BLOG - 24. Oct 2025
Help Shape the Future of Portmaster: Take the 2025 User Survey
Viktor
BLOG - 26. Aug 2025
Portmaster v2 is Here: Foundation for the Future
Viktor
BLOG - 23. Jul 2025
Safing Joins Forces with IVPN: A New Chapter Begins
Raphael
BLOG - 3. Dec 2024
Company Journey Update Jan
Raphael
BLOG - 2. Jan 2024