Microsoft Activation Scripts (MAS): The Open-Source Activation Toolkit

Microsoft Activation Scripts, known as MAS, is an open-source activation toolkit developed by the Massgrave collective and hosted publicly on GitHub. Unlike older closed-source activators, MAS ships as plain-text PowerShell scripts that anyone can read and audit before running. This transparency has made it the most recommended activation method in 2026.

Four Activation Methods

MAS provides four distinct methods: HWID (generates a genuine permanent digital license for Windows), Ohook (permanent Office activation), KMS38 (activation until 2038), and Online KMS (standard 180-day renewable KMS). Each method uses a different technical approach, but all rely on legitimate activation paths built into Windows rather than binary hacking.

For a detailed walkthrough of each method, comparison tables, and the installation command, see the complete MAS activator guide.

The Distribution Command

MAS is launched with a single PowerShell one-liner: irm https://get.activated.win | iex. This downloads and runs the latest release directly from the project's distribution endpoint. The interface presents a text menu for selecting the activation method.

Why Open Source Matters

The key advantage of MAS over tools like KMSPico or KMSAuto is auditability. Because every line of script is publicly visible on GitHub, security researchers can verify exactly what the tool does. Closed-source binaries like the Windows Loader require trust that the downloaded file contains only activation logic.