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Portmaster project preview
SecurityAlternative to GlassWireAlternative to AdGuard ProAlternative to Little Snitch

Portmaster

Free and open-source application firewall that blocks trackers and encrypts DNS requests.

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LicenseAGPL-3.0
GitHub stars8.5k
Last commit1 weeks ago
Tags5 topics
Secure Dns Over TlsTracker BlockerPrivacy FirewallApp Network IsolationSecurity
Overview

Why consider Portmaster?

Portmaster is a privacy application and interactive firewall for Windows and Linux. It automatically blocks ads and telemetry trackers, forces DNS-over-TLS encryption, allows granular per-app network isolation, and gives visual insight into background internet activity.

Guided learning

Learn Portmaster by building

Practical setup notes, real use cases, and copy-ready examples in one focused guide.

1 min read 2 sections
In this guide2 sections

Overview of Portmaster

Portmaster puts you in complete control of all network activity across every installed app on your computer.

Quickstart

  1. Download Portmaster installer for Windows or Linux.
  2. Complete setup to automatically route DNS queries through encrypted DNS-over-TLS providers (Quad9, Cloudflare).
  3. Review the live connection feed to block individual outgoing trackers and telemetry beacons.

Portmaster is licensed under the GNU Affero General Public License v3.0.

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Portmaster FAQs

Portmaster is listed as a Security tool on TiloBox. Review the overview, features, and official documentation on this page to decide whether it solves your specific workflow.

Start with the project's GitHub repository and official website for supported installation and deployment instructions. Test the setup with representative data or a small project before rolling it out more widely.

Portmaster is listed under the AGPL-3.0 license. Read the complete license text and the project's notices before using, modifying, or distributing the software.

Production readiness depends on your requirements. Review maintenance activity, security practices, documentation, backup and upgrade procedures, and compatibility with your stack; then validate it in a non-production environment.

Portmaster is listed as an alternative to GlassWire. Compare the core workflow, deployment model, integrations, and licensing against your must-have requirements before switching.