How to Find Your Windows Product Key Before Reinstalling

The old days of finding your Windows key on a sticker under the laptop are mostly gone. On most modern PCs, the product key is embedded in the UEFI firmware or stored in the Windows registry — invisible unless you know where to look. This guide shows you three ways to retrieve it in under a minute, before you wipe your drive.

Whether you're doing a clean reinstall, swapping to a new hard drive, or just want a permanent record of your license, all three methods below work on Windows 10 and Windows 11 — including OEM, retail, and volume license installations.

Method 1: Find Windows Product Key Using Command Prompt

This is the fastest method and works on all versions of Windows 10 and 11.

Step 1: Open Command Prompt as Administrator

• Press Windows + R, type cmd, then press Ctrl + Shift + Enter to run as administrator.
• Or search "Command Prompt" in the Start menu, right-click, and select Run as administrator.

Step 2: Run the Product Key Command

Type or paste the following command and press Enter:

wmic path softwarelicensingservice get OA3xOriginalProductKey

Your 25-character product key will appear below the command, in the format XXXXX-XXXXX-XXXXX-XXXXX-XXXXX.

Step 3: Save the Key

Copy the key and paste it into a text file. Save that file to a USB drive or another device — not the drive you're about to reinstall.

Method 2: Find Windows Product Key Using PowerShell

PowerShell can retrieve the product key stored in the registry using a slightly more detailed script. This method is useful if the wmic command returns a blank result.

Step 1: Open PowerShell as Administrator

• Press Windows + X and select Windows PowerShell (Admin) or Terminal (Admin).

Step 2: Run the Script

Paste the following command and press Enter:

(Get-WmiObject -query 'select * from SoftwareLicensingService').OA3xOriginalProductKey

If a key is stored in the firmware, it will be shown. Copy and save it immediately.

Alternative PowerShell Script for Registry Key

For keys stored in the Windows registry (common on retail installations), use:

$regPath = 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion' $key = (Get-ItemProperty $regPath).DigitalProductId # Decode key from binary $keyOffset = 52 $isWin8 = [int]($key[66] / 6) -band 1 $key[66] = ($key[66] -band 0xF7) -bor (($isWin8 -band 2) * 4) $chars = 'BCDFGHJKMPQRTVWXY2346789' $result = '' for ($i = 24; $i -ge 0; $i--) { $cur = 0 for ($j = 14; $j -ge 0; $j--) { $cur = ($cur * 256) -bxor $key[$keyOffset + $j] $key[$keyOffset + $j] = [int]($cur / 24) $cur = $cur % 24 } $result = $chars[$cur] + $result if (($i % 5 -eq 0) -and ($i -ne 0)) { $result = '-' + $result } } $result

Method 3: SterJo Key Finder (Easiest — Finds All Software Keys)

If you want to retrieve your Windows key and your Office key, Adobe license, and any other installed software licenses at the same time, SterJo Key Finder does everything in one step — no commands, no scripts.

How to Use SterJo Key Finder

1. Download SterJo Key Finder and run it — no installation needed.
2. All detected product keys are displayed immediately, grouped by software.
3. Click File → Save to export the complete list to a text file.
4. Save the file to a USB drive or external storage before reinstalling.

Method Comparison

OEM vs Retail vs Digital License — Does It Matter for Reinstalling?

Understanding your license type tells you whether you actually need to save your product key at all.

OEM License (most laptops and pre-built PCs)

On most PCs bought from manufacturers like Dell, HP, Lenovo, and Asus, the Windows license is embedded in the UEFI firmware chip on the motherboard. When you reinstall Windows, it activates automatically — no key entry needed. The wmic command will retrieve this key, but you often don't need it unless you're replacing the motherboard.

Retail License (boxed copy or key bought separately)

Retail licenses are tied to a Microsoft account once activated online. If you sign into the same Microsoft account after reinstalling, Windows re-activates automatically. If you're not using a Microsoft account, you'll need to enter the 25-character key manually — so backing it up is essential.

Digital License (Windows 10/11 free upgrade)

If you upgraded from Windows 7 or 8 to Windows 10 for free, or bought a new PC with Windows 10/11 pre-installed, you likely have a digital license. These are linked to your Microsoft account and reactivate automatically on the same hardware after reinstalling. No key needed — but sign in with the same Microsoft account.

What Else Should You Back Up Before Reinstalling?

Your Windows product key is just one piece of what you'll lose in a reinstall. Before you wipe the drive, also make sure you've saved:

• Browser passwords — use SterJo Browser Passwords to export Chrome, Firefox, Edge, and Opera credentials
• Wi-Fi passwords — use SterJo Wireless Passwords to export all saved wireless network keys
• Email account passwords — use SterJo Mail Passwords to save Outlook and Thunderbird credentials
• Windows Credential Manager entries — use SterJo Windows Credentials for network drive and Remote Desktop passwords
• Office and other software keys — SterJo Key Finder handles all of these alongside your Windows key

📚 Related Guides

Save Your Key Now — It Takes 30 Seconds

Whatever license type you have, knowing your Windows product key before a reinstall removes all uncertainty. SterJo Key Finder retrieves it instantly along with every other software license on your machine, and exports everything to a text file you can keep permanently.

And while you're at it — run the full pre-reinstall checklist. Saving your Wi-Fi passwords, browser credentials, and email passwords takes another 10 minutes and saves hours of frustration afterwards.

Download SterJo Key Finder Free →