How to find your Windows 11 product key (and when you don’t need one)

Applies to: Windows 11 Home and Pro on home and small-business PCs. Work and school PCs activated through a company license are handled by IT, not by a key you can look up.

This guide is about the Windows license only. Office uses separate keys, covered in how to find your Office product key.

Do you need a product key at all?

Windows activates with one of two things: a digital license, which needs no key, or a product key, a code of 25 characters in five groups such as XXXXX-XXXXX-XXXXX-XXXXX-XXXXX. Without either, Microsoft says the PC can’t be activated. Which one you have depends on how you got Windows, according to Microsoft’s Find your Windows product key page:

How you got Windows 11	What activates it	Where to look
Free upgrade from Windows 10	Digital license, no key	Nothing to find; check the Activation page
Pro upgrade bought in the Microsoft Store app	Digital license, no key	Confirmation email to your Microsoft account
New PC with Windows preinstalled	Key from the PC maker	Preinstalled, in the packaging or on a Certificate of Authenticity; otherwise ask the maker
Retail box	Product key	Label or card inside the box
Download from an authorized retailer	Product key	Confirmation email or the retailer’s digital locker
Download from Microsoft’s online store	Product key	Confirmation email, or Order history in your Microsoft account
Volume Licensing or MSDN at work	Organization’s key	That program’s web portal, or your IT admin

The practical point: a key matters mostly when Windows isn’t activated, or when you install Windows on hardware that has never been activated before. For a routine reinstall on the same PC, a digital license or the maker’s stored key usually does the job.

Check your activation status first

Go to Settings > System > Activation and read the line next to Activation status. Microsoft’s Activate Windows page describes these messages:

• Windows is activated with a digital license linked to your Microsoft account: you’re set. Reinstalls and most hardware changes can be handled by signing in with that account.
• Windows is activated with a digital license: activated, but not tied to an account yet. Link it now (see below) so you can reactivate later.
• Windows is activated: activated, usually with a product key, but no Microsoft account is linked.
• Windows is not activated: an error explains why. This is the case where you need a key or a license.

Also note your edition under Settings > System > About. Home and Pro use different licenses, and Microsoft says a Windows 11 Home license won’t activate Windows 11 Pro.

Where a Windows key is written down

If you did buy a key, it was given to you once, on paper or by email. Check these places:

• Card or label in the retail box. Keep the box; Microsoft points retail buyers to the retailer for help.
• Certificate of Authenticity (COA). Some PCs carry a COA sticker or card with the key. Microsoft notes the key may sit under a gray coating that you can gently scratch off with a coin or fingernail.
• Confirmation email. Search your inbox, including archive and spam folders, for the store’s name with “Windows” or “product key”. Digital retailers may also keep the key in a digital locker on their website.
• Microsoft Store order history. Microsoft says it keeps key records only for purchases from its own online store. Sign in at account.microsoft.com and open Order history to check.
• Volume Licensing or MSDN. The key comes from that program’s web portal, usually managed by IT.

If none of these turn it up, Microsoft doesn’t offer a way to look up a lost retail key, apart from Microsoft Store purchases. Avoid programs that claim to pull keys out of Windows or sell “recovered” keys; they aren’t a Microsoft method, and a key shown that way may not be the one your license is based on.

PCs with the key stored in firmware

Most PCs sold with Windows preinstalled no longer come with a key printed on a sticker. Microsoft’s reinstall guide says Setup may skip the product key prompt when the PC’s firmware already contains a key, and applies that key automatically. That is why a clean install on such a PC often activates without you typing anything.

You don’t normally need to read that key. If you want to see which key Windows is using, slmgr /dli in Command Prompt shows license details with only part of the key. Microsoft’s documentation for PC makers notes that on such PCs this partial key may not match the one stored in firmware, so treat it as a rough check, not proof. If a PC maker’s key won’t activate, contact the maker, as Microsoft advises for preinstalled Windows.

Link your license to a Microsoft account

Linking turns a digital license into something you can recover by signing in, which is what makes a key unnecessary later. The steps from Microsoft’s Activate Windows page:

1. Sign in to Windows as an administrator. In Settings > Accounts > Your info, Administrator should appear under your name.
2. Check that an email address is shown there too. That means you’re using a Microsoft account rather than a local account.
3. Go to Settings > System > Activation, select Add an account and sign in with your Microsoft account.

The status should then read that Windows is activated with a digital license linked to your Microsoft account. Do this before you reinstall Windows or change major hardware, not after.

Reinstalling Windows 11 without a key

A reset or reinstall on the same PC usually activates once it’s back online. For a clean install from USB, Microsoft’s reinstall guide gives this order:

1. Confirm Windows is activated and, ideally, linked to your Microsoft account.
2. Note your edition under Settings > System > About, and install the same edition.
3. When Setup asks for a key, select I don’t have a product key and choose that edition. On many PCs with a firmware key the prompt doesn’t appear at all.
4. After setup, connect to the internet and sign in with the linked account. Windows should activate online.

If you have neither a key nor a linked license, Microsoft’s advice is to cancel Setup and link the license first. For the wider choice between reset, repair install and clean install, see how to reinstall Windows 10; the options work much the same way on Windows 11. Building a USB stick is covered in our installation media guide.

After replacing the motherboard or other hardware

A major change, such as a new motherboard, can deactivate Windows because the digital license is tied to the hardware. Microsoft’s hardware change article describes the fix for a linked license:

1. Connect to the internet and sign in as an administrator.
2. Go to Settings > System > Activation > Troubleshoot.
3. Select I changed hardware on this device recently, then Next, and sign in with the linked Microsoft account.
4. Check the box next to This is the device I’m using right now, then select Activate.

If you activated with a retail key instead, enter it again under Settings > System > Activation > Change product key. Microsoft says that when a PC maker replaces the motherboard, the PC usually reactivates on its own.

If you have no key and no digital license

• PC came with Windows: contact the PC maker; the license belongs to that machine.
• Edition mismatch: if you installed Pro on a PC licensed for Home, reinstall Home. Moving up to Pro on purpose is covered in how to upgrade Windows Home to Pro.
• Genuinely unlicensed: on the Activation page, select Go to Store to buy a Windows 11 digital license, or buy a key from Microsoft or an authorized retailer. Keys from unofficial marketplaces can stop working later, so stick to those sources.
• Linked account lost, no key: Microsoft’s hardware change article suggests contacting Microsoft support.

Related guides

• How to find your Office product key (and when you don’t need one)
• How to upgrade Windows 10 Home to Pro (3 ways)
• How to reinstall Windows 10: reset, repair install or clean install
• Windows 10 installation media: create a USB or ISO (step by step)

Official sources

• Microsoft Support: Find your Windows product key
• Microsoft Support: Activate Windows
• Microsoft Support: Reinstall Windows with the installation media