Your Windows product key is usually on a sticker attached to your device, in your Microsoft account, or in your Windows settings — the location depends on how you bought Windows and when.
If you bought a physical copy of Windows, the key is printed on a sticker inside the box or on the back of the disc case. If Windows came pre-installed on your computer, the key is typically on a sticker on the bottom or back of the device itself. If you bought Windows through Microsoft's website or the Microsoft Store, the key is stored in your Microsoft account. And if you're running Windows 10 or 11, your key may already be linked to your hardware and stored on Microsoft's servers — you might not need to find it at all to reinstall Windows.
The method you use to locate your key depends on which of these situations applies to you. This guide walks you through each one.
Key Takeaways
- Physical product keys are printed on stickers inside the box or on the device itself; digital keys purchased from Microsoft are stored in your Microsoft account.
- Windows 10 and 11 often tie your product key to your hardware automatically, so you may not need to find it to reinstall Windows on the same device.
- You can view your linked product key in Windows Settings under System > About, though the full key is usually hidden for security.
- Third-party tools can retrieve your product key from your system, but only use reputable software from established vendors.
- If you cannot find your key and cannot reinstall Windows, contact Microsoft Support with proof of purchase.
Check the physical sticker on your device or packaging
The easiest place to look first is the sticker that came with your computer or Windows installation media. If you bought a pre-built computer from a manufacturer like Dell, HP, Lenovo, or Asus, look on the bottom of the laptop or the back of the desktop tower. The sticker usually shows "Windows" or "Microsoft" and a 25-character code in five groups of five letters and numbers separated by hyphens.
If you bought a physical copy of Windows (less common now, but still sold), check inside the box and on the back of the disc case. The key card is typically a small printed card with the product key printed clearly on it. Keep this sticker or card in a safe place — you'll need it if you ever reinstall Windows on that device.
Take a photo of the sticker with your phone and store it somewhere secure, like a password manager or a cloud storage folder. This way you have a backup if the sticker fades or becomes unreadable.
Look in your Microsoft account for digital purchases
If you bought Windows directly from Microsoft through their website or the Microsoft Store, your product key is tied to your Microsoft account rather than printed on a physical sticker. Sign in to your Microsoft account at account.microsoft.com, then look for a section labeled "Services & subscriptions" or "Digital content" — the exact name varies depending on when your account was created.
You should see a list of products you've purchased. Click on Windows to view the product key associated with that purchase. Microsoft will display the key in a format you can copy and paste. Write this key down or store it securely, because you'll need it if you reinstall Windows on a different device.
If you don't see Windows listed in your account, check the email address you used to make the purchase. You may have used a different Microsoft account than the one you're currently signed into. If you still can't find it, look for a confirmation email from Microsoft with the subject line containing "product key" or "Windows" — the key is often included in that email.
Check Windows Settings for your linked product key
Windows 10 and 11 can store your product key on Microsoft's servers and link it to your device's hardware. This means you don't always need to enter a key to reinstall Windows — Microsoft can recognize your device and activate it automatically. To see whether your key is linked to your device, open Windows Settings and go to System > About. Scroll down to the "Windows specifications" section and look for "Product ID" or "Product Key Status."
If the status shows "Windows is activated with a digital license," your key is linked to your hardware. You don't need to find the physical key to reinstall Windows on this same device — Windows will reactivate automatically when you sign in with your Microsoft account after a fresh installation.
If the status shows something else, like "Windows is activated with a product key," your key is not yet linked to your hardware. You'll need the physical key or the key from your Microsoft account if you reinstall Windows on a different device.
Use a third-party tool to retrieve your key from your system
If you cannot find your product key anywhere else, you can use a third-party tool to extract it from your Windows installation. The key is stored in your system registry, and certain programs can read it and display it. Common tools include Belarc Advisor, Magical Jelly Bean Keyfinder, and ProduKey. Download only from the official website of the tool's creator — do not download from third-party software sites, which may bundle unwanted programs.
Run the tool and let it scan your system. It will display your Windows product key along with keys for other Microsoft products installed on your device, like Office. Copy the key and store it securely. This method works on Windows 7, 8, 10, and 11, though the key may not display in full on very new versions of Windows for security reasons.
Be aware that these tools are not made by Microsoft and are not officially supported. Use them only as a last resort when you cannot locate your key through the methods above. If the tool displays a key that doesn't work when you try to use it, the key may have been corrupted or the tool may have misread the registry.
What to do if you cannot find your product key
If you've checked all the locations above and still cannot find your key, you have two options. First, if you're reinstalling Windows on the same device where it was originally installed, you may not need the key at all — Windows 10 and 11 will often reactivate automatically using your digital license. Sign in with the Microsoft account you used to set up the device, and Windows should recognize it.
Second, if you need the key for a different reason — such as transferring Windows to a new device or proving ownership — contact Microsoft Support. Go to support.microsoft.com and search for "product key" to find the contact options. Have your proof of purchase ready, such as a receipt from the retailer or a confirmation email from Microsoft. Microsoft can sometimes provide a replacement key if you can verify that you own a legitimate copy of Windows.
If you bought Windows from a retailer like Best Buy or Amazon, you can also contact them directly with your receipt. They may be able to help you locate the key or provide a replacement.
Frequently Asked Questions
Do I need my product key to reinstall Windows on the same computer?
Not always. If you're reinstalling Windows 10 or 11 on the same device where it was originally installed, Windows will usually reactivate automatically when you sign in with your Microsoft account. You only need the key if Windows asks for it during installation or if you're moving Windows to a different device.
Can I use the same product key on multiple computers?
No. A Windows product key is licensed for one device only. If you try to use the same key on multiple computers, Windows will deactivate on all but one of them. If you need Windows on multiple devices, you need a separate key for each one.
What if the sticker on my device is worn out and unreadable?
Use a third-party tool like Belarc Advisor or Magical Jelly Bean Keyfinder to extract the key from your system registry. If that doesn't work, contact Microsoft Support with proof of purchase and they can help you recover it.
Is it safe to share my product key with someone else?
No. Your product key is like a password — treat it as confidential. Sharing it allows someone else to activate Windows on their device, which violates the license agreement. Store your key securely, just as you would a password.
What's the difference between a product key and a digital license?
A product key is a 25-character code you enter to activate Windows. A digital license is Microsoft's record that you own a legitimate copy of Windows, stored on their servers and linked to your device. Modern versions of Windows use digital licenses, so you may not need to enter a key at all.