Slmgr is Windows‘ command-line tool for checking and managing activation. Start with slmgr.vbs /dlv to view detailed license information. Commands such as /ato, /upk and /rearm do different jobs and should not be used as a random fix.
How to run a Slmgr command
Open Command Prompt and type one command at a time. The checks below show information without changing the installed key. For a command that changes activation, use Run as administrator when Microsoft‘s instructions require it.
Write a space between slmgr.vbs and the option. For example:
slmgr.vbs /dlvSlmgr commands that only show information
| Command | What it shows |
|---|---|
slmgr.vbs /dli |
Basic license information for the current Windows edition. |
slmgr.vbs /dlv |
More detail, including license status and channel information. |
slmgr.vbs /xpr |
Whether activation has an expiry date. |
slmgr.vbs /dti |
An installation ID used in an offline-activation process; it does not activate Windows. |
Keep full output private because it can include licensing identifiers. A channel label helps with troubleshooting, but does not replace your purchase records or license terms.
What does slmgr /ato do?
slmgr.vbs /ato asks Windows to attempt activation using its installed key and activation method. A retail or MAK setup may try online activation; a KMS client tries its organization’s activation service. It does not create a key or make an invalid license valid.
Commands that change Windows activation
| Command or option | Effect |
|---|---|
/ipk <product-key> |
Installs a supplied key that matches the installed edition; it can replace the current key. |
/ato |
Tries activation with the installed key and method. |
/upk |
Uninstalls the current key. Windows can be left unlicensed after a restart. |
/cpky |
Clears the stored key from the registry, rather than every activation record. |
/rearm |
Resets activation timers where supported; it is not a permanent activation method. |
Microsoft’s Slmgr option reference explains the exact syntax and permissions.
What happens when I run slmgr -rearm?
The documented /rearm option resets activation timers. It does not buy a license, install a valid product key or guarantee unlimited extensions. Follow the message and Microsoft’s instructions if you have already used it. For a normal activation error, start with Settings → System → Activation on Windows 11 and record the error code.
Can Slmgr transfer a Windows license to another PC?
Removing a key from one PC does not automatically let another PC use it. Retail, hardware-bound and organizational licenses have different rules. Check the license, edition and hardware-change instructions before removing anything from a working installation.
See existing Windows license checks and the supported Home-to-Pro upgrade steps. These commands manage Windows activation; they are not a general tool for activating every Microsoft product.
Updated October 14, 2026. Instructions and available features can vary by device, account and software version.