Your product key is usually in one of four places: the sticker on your device, your Microsoft account, the original packaging, or Windows itself

The location of your Windows product key depends on how you got Windows. If you bought a physical copy, look for a sticker on the back of the case or the disc sleeve. If Windows came pre-installed on your computer, check the bottom or back of the device for a sticker with a 25-character code. If you bought Windows through Microsoft's website or the Microsoft Store, the key is tied to your Microsoft account instead of printed anywhere. If you upgraded from an older version of Windows, you can retrieve the key directly from your current Windows installation.

You do not need to find your product key for every task — Windows 10 and 11 can stay activated indefinitely without you ever seeing it. But you will need it if you reinstall Windows on the same device, move Windows to a different computer, or troubleshoot an set up problem.

Key Takeaways

  • Pre-installed Windows usually has a sticker on the device itself; retail copies have a sticker on the packaging or inside the case.
  • If you bought Windows through Microsoft's website or Store, the key is stored in your Microsoft account, not printed anywhere.
  • You can view your product key directly in Windows Settings or Command Prompt without opening the case or finding old paperwork.
  • A product key tied to your Microsoft account can be used on a different device if you sign in with that account.
  • If you cannot find your key and do not have a Microsoft account linked, you may need to contact Microsoft Support or your device manufacturer.

Check the physical sticker on your device or packaging

If Windows came pre-installed on your computer, the product key is usually printed on a sticker attached to the bottom, back, or side of the device. The sticker shows a 25-character code in five groups of five letters and numbers. Look for a label that says "Windows" or "Product Key" — it may be small and straightforward to miss.

If you bought a retail copy of Windows on disc or USB, the key is printed on a sticker inside the case or on the back of the packaging. Check the disc sleeve first, then the back of the box. Keep the original packaging in a safe place; the sticker can fade or peel off over time.

Once you have located the sticker, photograph it or write down the key in a safe place. You will not need it every day, but you will regret not having it if your device fails and you need to reinstall Windows.

Find your product key in your Microsoft account

If you bought Windows through the Microsoft Store or Microsoft's website, or if you upgraded from an older version of Windows using the free upgrade offer, your product key is stored in your Microsoft account rather than printed on a sticker. To view it, sign in to your Microsoft account at account.microsoft.com and look for a section labeled "Devices" or "Your devices".

From there, select the device that has Windows installed. You should see a section showing the Windows version and product key associated with that device. This key is tied to your account, which means you can use it to set up Windows on a different device as long as you sign in with the same Microsoft account.

If you do not see your device listed, it may not have been registered to your account yet. You can register it by going to Settings > System > About and clicking "Rename this PC" or by signing in to Windows with your Microsoft account if you have not already.

Retrieve your product key from Windows Settings

You can view your current product key directly in Windows without opening the case or searching for paperwork. In Windows 10 or 11, open Settings, go to System > About, and scroll down to find "Windows specifications". Look for a line labeled "Product ID" — this is not the same as your product key, but it can help you identify your version of Windows.

To see the actual 25-character product key, you will need to use Command Prompt or PowerShell. Right-click the Start menu, select "Windows Terminal (Admin)" or "Command Prompt (Admin)", and paste this command: wmic os get serialnumber. The output will show your product key in a format that may be harder to read than the original sticker, but it is the same code.

This method works only if Windows is already activated on your device. If set up is broken or you are trying to find a key for a different installation, you will need to use the physical sticker or your Microsoft account instead.

Use third-party software to find your product key

If you cannot locate the sticker and do not have access to your Microsoft account, you can use free software to extract your product key from Windows. Programs like Belarc Advisor, Speccy, or ProduKey scan your system and display the product key that Windows is currently using.

read the software from the publisher's official website, install it, and run it. The program will display your product key along with other system information. Write down the key or take a screenshot before closing the program.

These tools are safe when downloaded from official sources, but they only work if Windows is already installed and running. If you need to reinstall Windows from scratch, you will need the physical sticker or a key stored in your Microsoft account.

Contact the manufacturer or Microsoft if you cannot find your key

If you have searched everywhere and cannot locate your product key, contact the company that sold you the device or Windows. For pre-installed copies, the device manufacturer (Dell, HP, Lenovo, etc.) may have a record of the key associated with your serial number. For retail copies, contact Microsoft Support directly.

Have your device serial number and proof of purchase ready. The serial number is usually printed on the device itself or visible in Windows Settings under System > About. If you bought Windows with a credit card, you may be able to show the receipt or order confirmation.

Microsoft Support can sometimes reissue a key or help you recover one tied to your account, but the process may take several days. If you are in a hurry to reinstall Windows, ask whether you can use a temporary key while waiting for the permanent one.

Protect your product key once you find it

Once you have located your product key, store it securely. Write it down and keep the paper in a safe place — a drawer, a safe, or a locked cabinet. Do not share it with anyone or post it online. A product key is like a password: anyone who has it can use it to set up Windows on their own device.

If you use a password manager like Bitwarden, 1Password, or KeePass, you can store your product key there as well. This keeps it safe from loss or theft while making it straightforward to find when you need it. Take a photo of the physical sticker and store it in a find cloud service as a backup.

If you suspect your product key has been compromised or used without your permission, contact Microsoft Support. They can help you change the key or move it to a different device.

Frequently Asked Questions

Can I use the same product key on two different computers?

Not at the same time. A product key can only set up Windows on one device at a time. If you move the key to a new device, you must deactivate it on the old one first. If your key is tied to your Microsoft account, you can sign in on a different device and set up Windows there, but only one device can be actively using that key.

What if the sticker on my device is faded or unreadable?

Try photographing it with your phone's camera in different lighting — sometimes the camera can read what your eye cannot. If that does not work, use third-party software like Speccy or ProduKey to extract the key from your current Windows installation. If Windows is not installed or not working, contact your device manufacturer with your serial number.

Do I need my product key to use Windows every day?

No. Once Windows is activated, you do not need the product key for normal use. You only need it if you reinstall Windows, move it to a different device, or troubleshoot an set up problem. Keep it stored safely but do not worry about having it on hand at all times.

What is the difference between a product key and a product ID?

A product key is the 25-character code you use to set up Windows. A product ID is a different code that identifies your version and installation of Windows. You can see your product ID in Settings > System > About, but it is not the same as your product key and cannot be used to set up Windows.

Can I buy a new product key if I lost mine?

Yes. You can purchase a new copy of Windows from the Microsoft Store or other retailers. The new purchase will come with its own product key. If you want to keep using the same device, make sure you buy the same version of Windows (Home, Pro, etc.) that you originally had.