22 Free Product Key Finder Programs

A List of the Best Free Product Key Finder Software Programs

If you're preparing to reinstall a program or an operating system (like a clean install of Windows), you'll need to find your unique product key (CD key) or serial number before continuing.

Normally this product key is located with the original install disc, or maybe in your order confirmation email. If you've lost your product key you can often find it in the Windows Registry but this can be difficult, or sometimes even impossible, to do. Luckily, there are many free key finder programs available to help.

Important: Please read my Key Finder Programs FAQ for lots of helpful information. This isn't an easy topic, especially if you're new to it.

Below are the top 22 free key finder programs. I also keep a list of commercial key finder programs but I highly recommend that you exhaust the options below before paying for one.

1
Belarc Advisor

Screenshot of Belarc Advisor 8.5c in Windows 10
Belarc Advisor 8.5c.

Belarc Advisor is the standard when it comes to system information software. I've been using this program for many, many years. One small aspect of Belarc Advisor is its ability to extract product keys for many software programs, including the one for Windows.

Advantages include display of information in your browser window, no adware/toolbars to worry about, and an extensive list of other important computer data.

Finds Keys for Operating Systems: Windows 10, Windows 8 & 8.1, Windows 7, Windows Vista, Windows Server 2012/2008/2003, Windows XP, Windows 2000, Windows NT, Windows ME, Windows 98, and Windows 95.

Finds Keys for Other Software: Microsoft Office 2013, 2010, (plus all previous versions), Microsoft enterprise products, most programs from Adobe, Nero, Corel, and more, as well as keys for popular video games.

Belarc Advisor v8.5c Review and Free Download

Please try Belarc Advisor for your software and Windows key finding needs before any other program. It's likely to provide you with the best results.

2
Magical Jelly Bean Keyfinder

Screenshot of Magic Jelly Bean Keyfinder v2.0.10.11 in Windows 8
Magic Jelly Bean Keyfinder v2.0.10.11.

The Magical Jelly Bean Keyfinder program is a free utility that retrieves product keys from the registry. It also has the ability to find product keys for Microsoft Office programs, along with product keys from many other non-Microsoft programs.

Advantages include very small size, ease of use, instant display of product keys and multiple product key saving options.

Finds Keys for Operating Systems: Windows 10, Windows 8, Windows 7, Windows Vista, Windows Server 2003, Windows XP, Windows 2000, Windows ME, Windows 98, and Windows 95.

Finds Keys for Other Software: Microsoft Office 2007, Office 2003, Office XP, and several non-Microsoft programs.

Magical Jelly Bean Keyfinder v2.0.10.11 Review and Free Download

The Magical Jelly Bean Keyfinder website says that this free key finder will find your Office 2010 product key but in fact it does not, at least as of v2.0.10.11.

3
Winkeyfinder

Screenshot of Winkeyfinder v1.75 in Windows 7
Winkeyfinder v1.75.

The Winkeyfinder program is another free utility that retrieves product keys from the Windows registry.

Advantages include small program size, no installation required, and additional features such as the ability to change registered user information.

Finds Keys for Operating Systems: Windows 7, Windows Vista, Windows XP, Windows 2000, Windows ME, and Windows 98.

Finds Keys for Other Software: Microsoft Office 2010, 2007, 2003, XP, 2000 SP2, and 97.

Winkeyfinder v1.75 Review and Free Download

Though it will display a product key for Windows 10, Winkeyfinder doesn't support that version of Windows, so the key it shows is not correct.

4
LicenseCrawler

Screenshot of LicenseCrawler v1.52 in Windows 8
LicenseCrawler v1.52.

LicenseCrawler is another well put together free key finder tool.

LicenseCrawler differs from other key finder programs in its almost full-text interface, which I like. I found LicenseCrawler to be very effective at finding serial numbers for the many programs on my PC.

Finds Keys for Operating Systems: Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, Windows Server 2003, and Windows 2000.

Finds Keys for Other Software: Microsoft Office 2013, Office 2010, Office 2007, Office 2003, most Adobe products, and many more.

LicenseCrawler v1.82 Review and Free Download

I was able to test LicenceCrawler in Windows 10 and Windows 8 without finding any problems.

5
Keyfinder Thing

Screenshot of Keyfinder Thing
Keyfinder Thing v3.1.6. © Matt Chugg

Keyfinder Thing is another free, easy to use utility that finds product keys and serial numbers hidden in the Windows registry.

Advantages include small program size, nothing to run, and support for a large list of non-Microsoft programs.

Finds Keys for Operating Systems: Windows 7, Windows Vista, Windows 2003 Server, Windows XP, Windows 2000, and Windows ME. 

Finds Keys for Other Software: Microsoft Office 2007, Office 2003, Office XP, Microsoft Money, Nero, Corel Suite, The Sims, and many more programs.

Keyfinder Thing v3.1.6 Review and Free Download

Keyfinder Thing does not find the right product keys for Windows 10, Windows 8, or Windows NT, even though one may show up in the results. I tested it in Windows XP and didn't find issues.

6
Product Key Finder

Product Key Finder v2.0.9

The not-so-originally-named Product Key Finder tool is actually a pretty good key finder program.

After executing Product Key Finder, a simple window opens displaying your Windows product key along with other product keys and serial numbers that Product Key Finder can locate.

Finds Keys for Operating Systems: Windows 7, Windows Vista, Windows Server 2008 & 2003, Windows XP, Windows 2000, Windows 98, and Windows NT.

Finds Keys for Other Software: Most Microsoft and Adobe applications, more than 200 in all according to the Product Key Finder website.

Product Key Finder v2.2.4 Review and Free Download

Unfortunately, Product Key Finder doesn't find keys in Windows 8 or Windows 10.

7
ProduKey

Screenshot of ProduKey v1.83 in Windows 8
ProduKey v1.83.

ProduKey is another completely free and easy to use key finder tool.

The thing I liked best about ProduKey is how easy it is to do advanced key finder tasks like loading product keys from remote registries.

Finds Keys for Operating Systems: Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, and Windows 2000.

Finds Keys for Other Software: Microsoft Office 2013, Office 2010, Office 2007, Office 2003, Exchange Server, and SQL Server.

ProduKey v1.87 Review and Free Download

Everything worked fine for me with ProduKey when I used it in Windows 10 and Windows 8.

8
Windows Product Key Finder Pro

Screenshot of Windows Product Key Finder Pro v2.3 in Windows 7
Windows Product Key Finder Pro v2.3. © Gear Box Computers

Gear Box's Windows Product Key Finder Pro is another fantastic utility that can find your Windows product keys. It can also find product keys for several Microsoft Office programs.

Advantages include a very small download size, the ability to run it from a flash drive or other portable device, no compressed files to extract, and nothing to run to display the keys. Windows Product Key Finder Pro instantly displays product keys and allows you to save or print them for safe keeping.

Finds Keys for Operating Systems: Windows 7, Windows Vista, Windows Server 2003, Windows XP, and Windows 2000.

Finds Keys for Other Software: Microsoft Office 2013, Office 2010, Office 2007, Office 2003, and Office XP.

Windows Product Key Finder Pro v2.3 Review and Free Download

Note: Don't let the name fool you. The "Pro" in Windows Product Key Finder Pro doesn't mean it costs - it's actually absolutely free to use.

It's said that Windows 8 is supported, but I was unable to find the product key when I tested v2.3. Windows Product Key Finder Pro is not compatible with Windows 10.

9
WinGuggle

Screenshot of WinGuggle v2.5 in Windows 8
WinGuggle v2.5.

WinGuggle is a very simple key finder program. WinGuggle easily finds product keys for popular Microsoft Windows operating systems and several Microsoft Office programs.

Major advantages include a quick download size, no installation required, access to a few advanced tools, and a very simple interface. WinGuggle instantly displays your Windows and Office product keys.

Finds Keys for Operating Systems: Windows 7, Windows Vista, and Windows XP.

Finds Keys for Other Software: Microsoft Office 2010, Office 2007, Office 2003, and Office XP.

WinGuggle v2.5 Review and Free Download

Though WinGuggle supports Windows 8, Windows 10, and MS Office 2013, it unfortunately did not find the correct keys when I tried it.

10
SIW

Screenshot of SIW in Windows
SIW v2011.10.29. © Gabriel Topala

SIW (System Information for Windows) is a portable program that displays tons of detailed information on your Windows installation and hardware devices.

Finds Keys for Operating Systems: Windows 7, Windows Vista, Windows XP, Windows Server 2003, Windows 2000, and Windows NT.

Finds Keys for Other Software: Microsoft Office 2010, Office 2007, Office 2003, Office XP and other Microsoft products as well as non-Microsoft applications like Adobe products, Norton, Nero, AutoCAD, and 150+ others

SIW v2011.10.29 Review and Free Download

Note: SIW doesn't look to still be in development, but even though no new updates have been released in a long while, it's still a great program.

SIW doesn't run in Windows 10 or Windows 8.

11
RockXP

RockXP v4.0

RockXP is another free program that retrieves lost product keys from the registry.

Advantages include small program size, no installation required, and additional features such as a password generator and password retriever.

Finds Keys for Operating Systems: Windows XP (officially) and also Windows Vista, Server 2003, 2000, ME, and 98.

Finds Keys for Other Software: Microsoft Office 2007 and Office 2003.

RockXP v4.0 Review and Free Download

I tried running RockXP in Windows 10 and Windows 7 but none of the menus seemed to work, rendering the program useless, which means it probably works in Windows XP only.

12
SterJo Key Finder

Screenshot of SterJo Key Finder in Windows 8
SterJo Key Finder v1.7. © SterJo Software

SterJo Key Finder is another key finder that finds product keys for over 500 games and software on either the local Windows install (your computer) or a remote one.

Finds Keys for Operating Systems: Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, Windows Server 2008, and Windows Server 2003.

Finds Keys for Other Software: Microsoft Office 2013, Office 2010, Office 2007, Office 2003, Office XP, Microsoft Money, Microsoft Works, and lots of other Microsoft and non-Microsoft programs like Adobe, Autodesk, Cyberlink, and others.

SterJo Key Finder is a great way to find product keys because the program is easy to read, you can search through the results, and it supports a huge number of products.

SterJo Key Finder v1.8 Review & Free Download

Unfortunately, SterJo Key Finder found two different product keys for one of the programs on my computer, which makes it hard to recommend above some of the other programs in my list.

13
Product Key Finder (OTT Solutions)

Product Key Finder 1.0

Product Key Finder won't win any creative name contests but that's not important - it's a very good key finder program.

I like Product Key Finder because it's designed very well, instantly finds product keys, allows an easy XML or CSV backup of keys found, and also lets you change your Windows registration or product key right from the tool.

Finds Keys for Operating Systems: Windows 7, Windows Vista, Windows Server 2008 & 2003, Windows XP, and Windows 2000.

Finds Keys for Other Software: Most Microsoft Office and other Microsoft programs, and many non-Microsoft applications.

Product Key Finder v1.0 Review and Free Download

I tested Product Key Finder in Windows 8 and Windows 10 but, unfortunately, the product key it showed was incorrect. 

14
MSKeyViewer Plus

Screenshot of MSKeyViewer Plus v2.5.0 in Windows 7
MSKeyViewer Plus v2.5.0.

MSKeyViewer Plus is another good product key finder program.

Major advantages include a really small size, no install needed, and super easy interface. MSKeyViewer Plus instantly displays product keys - no scanning of your registry required.

Finds Keys for Operating Systems: Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000, Windows ME, Windows 95/98, and Windows Server 2008 & 2003. 64-bit versions are also supported.

Finds Keys for Other Software: Microsoft Office 2013, Office 2010, Office 2007, Office 2003, Office XP, Office 2000, Windows Server 2012 & 2008, plus a long list of other Microsoft and non-Microsoft programs.

Though the other Windows 8 compatible programs from this list were able to find the product key for my installation, MSKeyViewer Plus wasn't able to do so.

MSKeyViewer Plus v2.5.0 Review and Free Download

I'd probably pick several other key finders before MSKeyViewer Plus, but if you're having trouble finding a specific key, give MSKeyViewer a try.

MSKeyViewer Plus may find a key for your Windows 10 installation, but it's probably going to be incorrect just like mine was.

15
Free PC Audit

Screenshot of Free PC Audit in Windows 8
Free PC Audit. © MIS Utilities

Free PC Audit is a system information tool that shows not only hardware information but also product keys for several Windows and Microsoft Office installs.

It's very small, completely portable, scans automatically, and lets you easily copy out product keys.

Finds Keys for Operating Systems: Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, and probably older versions as well.

Finds Keys for Other Software: Microsoft Office 2013, Office 2010, 2007, Office 2003, and likely some older versions, as well as some Adobe and Corel software.

Free PC Audit v3.3 Review and Free Download

Because there is so much other information shown in Free PC Audit, it can seem very cluttered if you're using it just for finding product keys.

16
Windows Product Key Viewer

Screenshot of Windows Product Key Viewer in Windows 8
Windows Product Key Viewer. © RJL Software, Inc.

Windows Product Key Viewer is another key finder program that shows the product key for several versions of Windows.

You can easily copy the product key out of the program, print the keys, or save them to a file. Additional details are shown as well, such as the product ID, install date, and build number.

Finds Keys for Operating Systems: Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000, Windows ME, Windows 98, Windows 95, and Windows Server 2008/2003

Windows Product Key Viewer v1.07 Review & Free Download

Due to Windows Product Key Viewer's small size and portability, it's a great product key finder to store on a flash drive.

17
Lazesoft Windows Key Finder

Screenshot of Lazesoft Windows Key Finder
Lazesoft Windows Key Finder. © Lazesoft

Lazesoft Windows Key Finder is another free program that can find the product key for many Windows installs and Microsoft Office versions.

The program is small, completely portable, and simple to read. You can print or save the product keys to a file.

Finds Keys for Operating Systems: Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000, and Windows Server 2012/2008/2003.

Finds Keys for Other Software: Microsoft Office 2013, Office 2010, Office 2007, Office 2003, and Office 2000.

Lazesoft Windows Key Finder v1.6 Review and Free Download

Though Microsoft Office 2013 is supported, I was unable to use Lazesoft Windows Key Finder to locate it in Windows 10, Windows 8, or Windows 7.

18
geProductKeys Finder

geProductKeys Finder

geProductKeys Finder might be the most simple key finder program I've ever seen. If all you're after is a quick product key display in Windows XP, geProductKeys does the job.

Advantages include a super small download, no installation needed, and as I mentioned above, a very simple interface.

Finds Keys for Operating Systems: Windows XP (officially) and possibly some older ones. geProductKeys does not work with Windows 10, Windows 8, Windows 7, or Windows Vista.

Finds Keys for Other Software: Some Microsoft Office programs and a few third party programs as well.

geProductKeys Finder v1.0 Review & Free Download

Note: You may have to disable Data Execution Prevention to use this program in Windows XP SP2 and later.

19
Product Key Informer

Product Key Informer 1.0.0

Product Key Informer is another free product key finder program but it finds product keys for only a few Microsoft programs other than the operating system.

Finds Keys for Operating Systems: Windows 7, Windows Vista, Windows XP, Windows 2000, Windows ME, and Windows 98.

Finds Keys for Other Software: Microsoft Office 2007, Office 2003, and Office XP.

Product Key Informer v1.0.0.190 Review & Free Download

Honestly, I didn't care much for Product Key Informer. I think it was the baked-in fields for specific product keys that bothered me. It's a waste of screen real estate and confirms that the program's product key finding abilities are very limited.

Windows 10 and Windows 8 are not supported.

20
Windows Product Key Finder

Screenshot of Windows Product Key Finder in Windows 7
Windows Product Key Finder.

Windows Product Key Finder is only 80 KB in size, is completely portable, and quickly shows the product key.

Finds Keys for Operating Systems: Windows 7, Windows Vista, and Windows XP.

Windows Product Key Finder v1.0 Review & Free Download

When compared to other key finder programs from this list, Windows Product Key Finder is extremely basic and void of support for anything but the Windows OS. Also, while it is able to open in Windows 8 and 10, the product key it finds is inaccurate.

21
Game Key Revealer

Screenshot of Game Key Revealer
Game Key Revealer. © Mustafa Buğra AKTAŞ

Game Key Revealer shows the product keys of over 2000 games.

It's completely portable, takes up very little space, and can export keys to a text file or print them off.

Finds Keys for Games: Half-Life, Battlefield 2, Counter-Strike, Mirror's Edge, Halo, Need for Speed, Dead Space, Crysis, Harry Potter, and many more.

Game Key Revealer v1.6.32 Review & Free Download

In addition to showing the product keys for a few thousand games, keys for nearly two dozen can actually be changed with Game Key Revealer, which could come in handy.

22
Abelssoft's MyKeyFinder

Screenshot of MyKeyFinder in Windows 7
MyKeyFinder. © Abelssoft

MyKeyFinder lets you save product keys to a PDF file or to the clipboard. You can also send one or more keys to a printer.

You can search through the list of install keys it finds and even blacklist registry keys to avoid finding serials in those locations.

Finds Keys for Operating Systems: Windows 10, Windows 8, Windows 7, Windows Vista, and Windows XP.

Finds Keys for Other Software: VMware, some Microsoft Office products, and others.

MyKeyFinder v2016 Review & Free Download

While testing MyKeyFinder, I found that a scan takes much longer to complete than any of the other programs from this list. Also, it found keys for programs that don't actually use serials, as well a key for Microsoft Office 2013 that wasn't correct.

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