What it is

Harden Windows Security is a GitHub repository and Windows-focused security project written in C# under the MIT license. It provides guides and tools for hardening Windows devices by using official, supported Microsoft methods rather than third-party components. The project lives in the Windows and Microsoft security ecosystem, including Defender, BitLocker, firewall configuration, audit, encryption, compliance, enterprise security, and Intune.

The concrete problem it addresses is the difficulty of fine-tuning Windows toward a locked-down state without guessing which settings are supported, safe, or effective. It gives users a documented path for personal, enterprise, government, and military security levels. It also helps enterprise users apply security policies, verify compliance, and receive a security score while avoiding added attack surface from outside components.

Key capabilities

• The project applies Windows built-in security features to harden the operating system without installing outside components or increasing the attack surface.
• The Harden System Security app secures personal and enterprise devices, removes unnecessary features or apps, and shows advanced security visibility.
• The repository offers Intune security policies for enterprise administrators to apply to workstations, then verify compliance and receive a security score.
• The AppControl Manager application is an open-source Windows application for configuring application control on Windows devices.
• The project provides guidance and tools for application control, audit, BitLocker, compliance, Defender, encryption, enterprise security, firewall configuration, first-party security, and operation-system security.
• The repository maintains SLSA Level 3 compliance for the development and build process, and it provides documentation, wiki pages, FAQs, resources, and a roadmap.

Who uses it and how

• Personal users install the Harden System Security app to harden their operating system, remove unnecessary features or apps, and inspect device security structure.
• Enterprise administrators apply the provided Intune security policies to workstations, then use the app to verify compliance and receive a security score.
• Security teams use the AppControl Manager application to configure application control on Windows devices.
• Organizations follow the repository guides to select security recommendations for personal, enterprise, government, or military environments.
• Users consult the linked documentation, wiki, and Microsoft Store listings to install and operate the apps.

Getting started

The README directs users to install Harden System Security or AppControl Manager from the Microsoft Store, then follow the linked documentation and wiki for setup.

When to use it — and when not to

Use the project when you want to harden Windows devices through Microsoft-supported features, documented guides, and apps distributed through the Microsoft Store. It is less suitable when you need a non-Windows solution or a hosted deployment, because the facts mention Windows apps, Microsoft Store installation, and Intune policies rather than a hosted option. The provided facts do not mention a database, storage, SMTP stack, or paid products it replaces; the repository metadata lists five open issues and no contributor count.