Quick answer: a Windows product key is a 25-character code (XXXXX-XXXXX-XXXXX-XXXXX-XXXXX). Where to find it depends on how you got Windows:
- New PC: preinstalled, in the PC’s packaging or on a Certificate of Authenticity (COA) sticker.
- Box bought in a shop: on a label or card inside the box.
- Bought online: in your purchase confirmation email, or in Order history of your Microsoft account for purchases from the Microsoft Store.
- Free upgrade: you usually have a digital license, so no key is needed.
Check first in Settings › System › Activation: if it says “digital license”, you don’t need a key to reinstall.
Independent guide: les-imprimantes.com is not affiliated with Microsoft. This guide follows Microsoft Support – Find your Windows product key, with our own field tips.
Sommaire
- Do you even need your product key?
- Where to find your Windows product key
- Find the key in your emails or Microsoft account
- Check the sticker on the PC
- Read the key stored in your PC’s firmware
- Link your license to your Microsoft account
- Lost your key? What you can do
- Reinstalling Windows: do you need the key?
- Related guides on les-imprimantes.com
- Frequently asked questions
Do you even need your product key?
Often, no. Windows 10 and 11 can be activated with a digital license, a method that doesn’t require typing a key. Without a key or a digital license, Windows can’t be activated.
- Press Windows + I and go to System › Activation (Windows 10: Update & Security › Activation).
- Read the Activation state:
| What it says | What it means | Do you need a key? |
|---|---|---|
| Active / activated with a digital license | Activation is tied to this PC (and possibly your Microsoft account) | No, reinstalling on the same PC reactivates automatically |
| Activated with a digital license linked to your Microsoft account | Same, and you can reactivate after a hardware change | No |
| Activated with a product key | Activated by a key | Keep the key for a reinstall on new hardware |
| Not active | No valid license found | Yes, or buy a license |
Where to find your Windows product key
According to Microsoft, the location depends on how you got Windows:
| How you got Windows | Where the key is | Who to contact |
|---|---|---|
| New PC with Windows | Preinstalled on the PC, in its packaging, or on the Certificate of Authenticity (COA) | The PC manufacturer |
| Retail box | On a label or card inside the box | The retailer |
| Digital copy from an authorized retailer | Confirmation email, or a digital locker on the retailer’s website | The retailer |
| Digital copy from Microsoft’s website | Confirmation email; Microsoft account › Order history | Microsoft |
| Free upgrade (Windows 10 to 11, or 7 / 8.1 to 10) | No key: a digital license | – |
| Pro upgrade bought in the Microsoft Store app | Digital license, sent to your Microsoft account email | Microsoft |
| Volume Licensing or MSDN | Your program’s web portal | Your organization or program admin |
Microsoft keeps key records only for purchases made on the Microsoft online store. Source: Microsoft Support.
Find the key in your emails or Microsoft account
- Search your mailbox for “Windows” “product key”, the shop’s name, or “order confirmation”.
- For a purchase on the Microsoft Store, sign in at account.microsoft.com and open Order history.
- For a retailer, check your account on their website: many store keys in a “digital locker” or “my downloads” section.
Check the sticker on the PC
On older PCs (often Windows 7 and 8 era), the key is printed on a Certificate of Authenticity sticker: under a laptop, on the side of a desktop tower, or inside the battery compartment. Recent PCs usually have no sticker: the key is stored in the firmware (see below).
Read the key stored in your PC’s firmware
Most PCs sold with Windows 8 or later have the original key embedded in the firmware (UEFI/BIOS). Windows reads it automatically when you reinstall the same edition. To display it, open PowerShell or Terminal and run:
(Get-CimInstance -ClassName SoftwareLicensingService).OA3xOriginalProductKey- A 25-character key appears: it’s the original key from the PC manufacturer.
- Nothing appears: your PC has no embedded key (common with digital licenses, upgrades and custom-built PCs).
To see which kind of license is active, run slmgr /dli in Command Prompt. It shows the license type and only the last 5 characters of the installed key.
Note: these commands aren’t in Microsoft’s “find your product key” article; they’re standard Windows tools we use in support. The older wmic command may not be available on recent Windows 11 versions.
Link your license to your Microsoft account
Linking your digital license to your Microsoft account makes reactivation easier after a hardware change, such as a new motherboard:
- Sign in to Windows with your Microsoft account (Settings › Accounts › Your info).
- Go to Settings › System › Activation.
- Check that it says the license is linked to your Microsoft account.
After a hardware change, use the Troubleshoot option on the Activation page and choose your device to reactivate.
Lost your key? What you can do
| Situation | What to do |
|---|---|
| PC came with Windows | Reinstall the same edition: the firmware key or digital license activates it; otherwise contact the PC manufacturer |
| Bought from a retailer | Check your emails and your retailer account, then contact the retailer |
| Bought on Microsoft’s online store | Microsoft account › Order history, or contact Microsoft support |
| Free upgrade | No key needed: digital license |
| Windows 7 or 8.1 | Check the box or the sticker; if lost, contact the manufacturer |
| Office, games or apps key | See Microsoft’s separate article on finding Microsoft downloads and product keys |
Beware of very cheap keys and “key finder” downloads: keys sold for a few euros on marketplaces are often resold or volume keys that can be deactivated later. Free “key recovery” tools from unknown sites can contain malware. Microsoft also warns about support scams: it never calls you unsolicited about your license.
Reinstalling Windows: do you need the key?
- Same PC, same edition, digital license or firmware key: no. During setup, choose I don’t have a product key; Windows activates once online.
- Different edition (for example Pro instead of Home): you need a key for that edition.
- After a big hardware change: use the Activation troubleshooter with your Microsoft account.
Before reinstalling, see our guide to reset your PC for a fresh start.
🛠️ Real-world case: “I need my key to reinstall Windows”
| Situation | Owner of a 4-year-old laptop wanted to reinstall Windows 11 and couldn’t find any sticker or email with a key |
|---|---|
| Diagnosis | The firmware command showed an original Windows Home key, and Activation said “digital license” |
| Result | Reinstalled Windows 11 Home choosing “I don’t have a product key”; activated automatically once connected to the internet |
| Time | Check took 2 minutes |
Takeaway: on most modern PCs, you don’t need to find the key at all. Check the Activation page before searching.
Related guides on les-imprimantes.com
- Reset your PC for a fresh start in Windows
- Install a pending Windows update (in French)
- Uninstall a program (in French)
- All our Windows guides
Frequently asked questions
How do I find my Windows product key?
It depends on how you got Windows: on a new PC it’s preinstalled or on a COA sticker; for a retail box, inside the box; for an online purchase, in the confirmation email or your Microsoft account Order history. Free upgrades use a digital license instead.
What does a Windows product key look like?
It’s a 25-character code in five groups: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX.
Do I need a product key to reinstall Windows 11?
Usually not. If your PC has a digital license or a key in its firmware, choose I don’t have a product key during setup; Windows activates once online.
Can I see my product key in Windows?
The Activation page shows the activation state, not the full key. The PowerShell command in this guide shows the original key stored in the firmware, when there is one.
What is a digital license?
It’s an activation method for Windows 10 and 11 that doesn’t require typing a product key. It’s common after free upgrades and Microsoft Store purchases.
Can Microsoft give me my lost product key?
Microsoft keeps key records only for purchases on its online store, visible in your Microsoft account Order history. For other purchases, contact the PC manufacturer or retailer.
Are cheap Windows keys safe?
Keys sold far below the normal price are often resold or volume keys that can stop working. Buy from Microsoft or authorized retailers.
