KMS Auto is a free utility that emulates a Key Management Service (KMS) host on your own computer. Microsoft originally designed KMS so that large organizations could activate hundreds of machines through a single internal server. KMS Auto reproduces that behavior locally — no external server, no cost.

• 💸 Zero cost — no purchase, no subscription
• 🪶 Tiny footprint — typically under 15 MB
• 🔁 Automatic renewal — set once, forget about it
• 🧰 Windows + Office — handles both in one interface
• 🧱 Portable option — run without full installation
• 🌐 Offline after setup — no persistent connection needed

KMS Auto doesn't crack anything — it reuses a legitimate Microsoft mechanism. Because KMS was built for volume licensing, the activation path itself is free to emulate. That's why the tool costs nothing and why it can renew indefinitely.

✅ OS: Windows 10 (Home, Pro, Enterprise, Education)
✅ Architecture: x86 (32-bit) or x64 (64-bit)
✅ RAM: 2 GB minimum (4 GB recommended)
✅ Storage: 150 MB free space
✅ Privileges: Administrator account required
✅ .NET Framework 4.0 or newer
✅ Windows Defender temporarily paused
✅ Internet connection for initial activation

⚠️ Reminder: Create a restore point first. Go to Control Panel → System → System Protection → Create. If anything misbehaves, you can roll back safely.

The file is small — usually 5–15 MB — and should finish downloading in under a minute on most connections. Pick the build that matches your Windows 10 version.

Temporarily disable real-time protection: Windows Security → Virus & threat protection → Manage settings → Real-time protection → Off. Also add an exclusion folder so the tool isn't quarantined mid-run.

Settings → Update & Security → Windows Security
→ Virus & threat protection → Exclusions → Add folder

Right-click the downloaded file → Extract All… → choose a folder. If the archive asks for a password, check the source page.

Find KMSAuto.exe, right-click it, and choose Run as administrator. Confirm the UAC prompt.

💡 If SmartScreen appears, click More info → Run anyway.

In the main window, press Activation, then Install KMS Service. Components land in C:\Windows\KMSAutoS. Wait for the success message.

Choose Activate Windows. The tool contacts the local KMS host and installs the token. A green checkmark confirms success.

Open Command Prompt as administrator and run:

slmgr /xpr

A message saying the machine is permanently activated means everything worked.

For deeper detail:

slmgr /dlv

Open Task Scheduler → Task Scheduler Library and check that the KMSAuto task exists and is enabled. This keeps the 180-day cycle refreshed.

Re-enable real-time protection and add the KMS folder to exclusions so future scans don't remove it.

Switch to the Office tab and press Activate Office. The flow mirrors Windows activation.

sc stop "KMSAuto"
sc delete "KMSAuto"
del /f /q C:\Windows\KMSAutoS\*

Reboot, then reinstall.

Q: Is KMS Auto really free? A: Yes — it uses Microsoft's own KMS mechanism, so there's no cost.

Q: How long does activation last? A: 180 days, renewed automatically each day.

Q: Does it work on Windows 10 22H2? A: Yes, all current Windows 10 builds are supported.

Q: Will it harm my system? A: It doesn't modify core files, so it's generally safe from trusted sources.

Q: Can I remove it later? A: Yes — use the uninstaller or the manual cleanup above.

Q: Does it activate Office? A: Yes, Office 2013–2021 and 365 volume editions.

Q: Why does my AV flag it? A: Activation tools are commonly flagged as "potentially unwanted" — usually a false positive.

Q: Do I need internet every day? A: No, only during setup and renewal checks.