Portmaster is a free and open-source application firewall that does the heavy lifting for you. Restore privacy and take back control over all your computer's 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.
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.
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.
Publisher’s description
What is Portmaster?
Portmaster is an open-source firewall & privacy program for Windows from Safing ICS Technologies GmbH. It ranks 8th by popularity among firewall & privacy in this catalogue. It is written in Go.
Installation and requirements
Official installers exist for 64-bit as EXE (NSIS). The main installer is 93.7 MB. Installation asks for administrator rights. The installer supports unattended (silent) installation.
Updates and version history
The current version is 2.2.3, released on August 21, 2026. 11 versions are listed since June 7, 2022, each with links to its own installer files. That is about 2.6 releases a year.
Popularity and file types
The Chocolatey package has been downloaded 21,439 times. The source code on GitHub (safing/portmaster) has 13,966 stars. Similar programs include OnionShare, dnscrypt-proxy and DingTalk Workspace CLI.
Project description on GitHub: “🏔 Love Freedom - ❌ Block Mass Surveillance”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Documented silent install
- Large user base
Cons
- No native ARM64 build
- Installation needs administrator rights
In short: Portmaster is an open-source firewall & privacy tool for 64-bit PCs. Administrators can deploy it unattended.
Is Portmaster safe to download?
- The file is served by updates.safing.io, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
E884F83D21BFF758C2F41701B8C6A22F33C8325D59CFE7E713BE6F5F532F8CB5· Open the VirusTotal report for this hash - The link answered when we last checked it (October 22, 2026)
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Security practices (OpenSSF Scorecard)
Automated checks of the safing/portmaster repository on GitHub by the Open Source Security Foundation, last run on October 19, 2026.
- No dangerous workflows10
- Actively maintained10
- Licence declared10
- Pinned dependencies7
- No binaries in the repository1
- Code review0
- Restricted token permissions0
- OpenSSF Best Practices badge0
- Security policy0
- Fuzzing0
- Static code analysis0
The score rates how the project is developed and released, not whether the program is safe to install. scorecard.dev
Recent versions
All 11 versions ›11 versions over 4 years · about 2.6 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 2.2.3Latest | August 21, 2026 | 93.7 MB | 64-bit EXE (NSIS) |
| 2.2.1 | June 11, 2026 | 101.5 MB | 64-bit EXE (NSIS) |
| 2.1.19 | May 11, 2026 | 97.7 MB | 64-bit EXE (NSIS) |
| 2.1.18 | April 27, 2026 | 95.7 MB | 64-bit EXE (NSIS) |
| 2.1.7 | December 9, 2025 | 81.9 MB | 64-bit EXE (NSIS) |
| 2.0.25 | September 5, 2025 | 81.7 MB | 64-bit EXE (NSIS) |
| 2.0.24 | August 5, 2025 | 79.3 MB | 64-bit EXE (NSIS) |
| 1.6.5 | June 1, 2023 | 6.5 MB | 32-bit EXE (NSIS) |
Install from the command line
Silent install ›winget install --id Safing.Portmaster -echoco install portmaster -yPortmaster_2.2.3_x64-setup.exe /SRelated guide: How to use winget: install and update apps
Information
- Publisher
- Safing ICS Technologies GmbH
- Category
- Firewall & privacy
- Licence
- GPL-3.0
- Price
- Free
- Source code
- github.com/safing/portmaster
- Written in
- Go
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- EXE (NSIS)
- Version
- 2.2.3
- Released
- August 21, 2026
- Added to the catalogue
- June 7, 2022
- Versions listed
- 11
- Updates / year
- 2.6
- Chocolatey downloads
- 21,439
- GitHub stars
- 13,966
- GitHub forks
- 600
- Website
- safing.io
- winget ID
- Safing.Portmaster
- Chocolatey package
- portmaster
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is Portmaster free?
Yes. Portmaster is open-source software under the GPL-3.0 licence.
Is Portmaster safe to download?
The download comes from updates.safing.io, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install Portmaster with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Can Portmaster be installed silently?
Yes. The silent install page lists the exact command for each installer.
Does Portmaster run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of Portmaster?
The versions page lists all 11 versions with links to their official installer files, back to June 7, 2022.
What are alternatives to Portmaster?
OnionShare, dnscrypt-proxy, DingTalk Workspace CLI, Prey Anti-Theft and WindowsSpyBlocker. The alternatives page compares them.
