Your product key is usually on a sticker or in your Microsoft account, depending on how you bought Windows

Your Windows 10 product key is a 25-character code that proves you own a copy of Windows. Where you find it depends on whether you bought Windows as a physical copy, a digital download, or whether it came pre-installed on your device. Most people find their key in one of three places: a sticker on the device itself, inside their Microsoft account, or in a confirmation email from the seller.

The fastest way to check is to sign into your Microsoft account on any web browser and look at your devices and licenses. If that doesn't show your key, the next step is to look for a physical sticker — usually on the bottom or back of a laptop, or on the case of a desktop computer. If you bought Windows from a retailer like Best Buy or Amazon, check your confirmation email or the packaging the software came in.

Key Takeaways

  • Your product key is a 25-character code printed on a sticker attached to your device, or stored in your Microsoft account if you bought Windows as a digital download.
  • Sign into your Microsoft account at account.microsoft.com, go to Devices, and select your device to see your product key if it's linked to that account.
  • If you bought Windows from a retailer, check your confirmation email, the product box, or the receipt — the key is often printed on all three.
  • Windows 10 will still work without entering a product key, but you'll see a watermark on your desktop and won't be able to customize your background or lock screen.

Check your Microsoft account first

If you bought Windows 10 as a digital download or if your device came with Windows linked to your Microsoft account, your product key should be stored there. Go to account.microsoft.com in any web browser and sign in with the email and password you use for Windows. Once you're signed in, click on "Devices" in the left menu, then select the device you're looking for from the list.

On the device details page, look for a section labeled "Product key" or "Windows product key." If it appears there, you can click to reveal the full 25-character code. Write it down or take a screenshot — you'll need this code if you ever reinstall Windows or move it to a different device. If you don't see a product key listed, your Windows may not be linked to this account, and you'll need to check for a physical sticker instead.

Look for a sticker on your device

If you bought a laptop or desktop computer with Windows already installed, the product key is usually printed on a sticker attached to the device. On laptops, check the bottom of the device, the back panel, or underneath the battery if it's removable. On desktop computers, look on the back of the case or on the side panel. The sticker will show a 25-character code in the format XXXXX-XXXXX-XXXXX-XXXXX-XXXXX, where X is a letter or number.

The sticker may also include a barcode and a label that says "Windows 10 Product Key," "Windows License," or "Certificate of Authenticity." If you can't find a sticker on the outside of your device, it may be inside — some manufacturers place it on the inside of a removable panel or battery compartment. If your device is very old or the sticker has worn away, you may not be able to read it, and you'll need to check your Microsoft account or your original purchase receipt instead.

Check your email and purchase receipts

If you bought Windows 10 from an online retailer like Amazon, Best Buy, or directly from Microsoft, the product key was sent to you in a confirmation email. Search your email inbox for messages from the retailer or from Microsoft, using keywords like "product key," "license," or "Windows 10." The key is usually in the body of the email or attached as a PDF file. If you bought a physical copy in a store, the key may be printed on the inside of the box, on the instruction card, or on a separate card inside the packaging.

If you can't find the original email, check your spam or promotions folder — confirmation emails sometimes get filtered there. If you bought the software years ago and your email account no longer exists, check any old receipts or invoices you may have kept. Some retailers also let you view your purchase history on their website — sign into your account and look for your Windows 10 purchase, which should show the product key or a link to retrieve it.

Use the Settings app to find your key on this device

If you're already using Windows 10 and need to find the product key for the copy that's currently installed, you can check the Settings app. Open Settings by pressing the Windows key and typing "Settings," then click on "System." In the left menu, click "About," and scroll down to find "Windows specifications." Look for a line that says "Product ID" — this is not the same as your product key, but it's linked to it.

The Product ID shown here won't give you the full 25-character product key directly, but it confirms that Windows is activated on this device. If you need the actual product key and it's not showing in Settings, you'll need to check your Microsoft account, look for a physical sticker, or contact the retailer where you bought Windows. Some third-party tools claim to retrieve your product key from Windows itself, but Microsoft does not recommend using these, as they can sometimes be unreliable or flagged by security software.

What to do if you can't find your product key

If you've checked all the places above and still can't find your product key, you have a few options. If you bought Windows from Microsoft directly, you can contact Microsoft support through their website and provide proof of purchase — they may be able to retrieve your key or issue a new one. If you bought from a retailer, contact them with your order number or receipt, and they can usually resend your product key or help you retrieve it from your account.

If you don't have proof of purchase and can't recover your key, you can still use Windows 10, but it will display a watermark on your desktop saying "Activate Windows" and you won't be able to change your background, lock screen, or some other personalization settings. You can continue using Windows this way indefinitely, or you can purchase a new product key from Microsoft or an authorized retailer. Before you buy a new key, make sure you've checked your Microsoft account one more time — sometimes keys are linked to accounts you may have forgotten about.

Frequently Asked Questions

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

No. Each Windows 10 product key is licensed for one device only. If you try to use the same key on a second computer, Windows will detect this and ask you to enter a different key. If you need Windows on multiple devices, you need to purchase a separate key for each one, or consider a Microsoft 365 subscription, which covers multiple devices.

What's the difference between a product key and a product ID?

A product key is the 25-character code you use to activate Windows. A product ID is a unique identifier that Windows generates for your device after activation. You need the product key to activate Windows, but the product ID is just for reference and won't help you reinstall or transfer Windows to another device.

Is my product key the same as my Microsoft account password?

No. Your product key is a separate code that proves you own a copy of Windows. Your Microsoft account password is what you use to sign into your account. You need both to fully set up Windows, but they are different things. Never share your product key with anyone, just like you wouldn't share your password.

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

If the sticker is too worn to read, check your Microsoft account — if Windows is linked to your account, the key should be stored there. If that doesn't work, contact the manufacturer of your device or the retailer where you bought it with your proof of purchase, and they may be able to provide a replacement key or help you recover it.