Best Free Folder Synchronization Utility


File synchronization utilities help you keep updated copies of files or folders in two or more locations, such as different computers, network drives, USB drives, or online storage. While a file sync utility could be used as a simple backup tool (called one-way syncing), its real power lies in keeping an identical set of working files in two or more locations.

An example of this would be keeping current versions of the same data files on both your home computer and office computer (two-way syncing). File sync utilities keep track of which files you create or change, or even delete in one location, and can create, change and delete those same files in the other location.

Criteria for the Evaluating a Synchronization Utility:

A good synchronization utility would have most or all the following features.

  • Should support two-way synchronization of files.
  • Should be able to replicate any source folder even if the files are in use.
  • Should detect conflicts or file collisions. These occur when a file has changed in both locations since the last sync operation. This requires that a database or journal be kept by the utility.
  • Should propagate deletions and detect file renames. This also requires a log file of previous operations.
  • Should support filters and rules for fine tuning what files are, or are not included in the sync operations.
  • Should show a preview of what is going to take place during a sync operation, and allow the user to easily over-ride any actions desired.
  • Should have a job scheduler and the ability to automatically detect and launch sync operations when a destination becomes active. (Such as plugging in a USB drive)
  • Should support syncing to both local and network locations.

There are are a lot of contenders in this category, but based on the criteria above, three stand out.

In a Hurry?

Go to details...  Go straight to the Quick Selection Guide


FreeFileSyncFreeFileSync is a solid contender here. The thing I like the best with this utility is its very clear and informative interface.

The preview is very easy to understand, and file collisions and deletions are more readily recognizable than many other sync programs. If you require a sync program that can copy files that are in use or locked, FreeFileSync has you covered there too!

Unfortunately it only has very basic filters, no auto sync feature, and no direct support for FTP. My final complaint would be that its help file is a little sparse. Those few flaws aside, I found it to be well designed and easy to use.

Caution! FreeFileSync is now bundled with OpenCandy. See our information page for details.


Allway SyncAllway Sync is my second recommendation. It is a very well rounded product with loads of features. It has a very robust filter and rule set and definitely has the edge here over the other reviewed products.

It also offers support for FTP, scheduling, and auto syncing. It has a very thorough help file which can be of great benefit especially to those who are new to synchronization programs.

One draw back I found is that while it does detect file collisions and deletions, it is not very clear how to choose which versions of conflicting files to keep and which to overwrite. You should also be aware that in the free version of Allway Sync, there is a file operation limit of 40,000 files in any 30 day period. So if you have a large amount of files to synchronize on a daily basis you might need to look at a different choice. Also note that it does not support copying locked files as the developers feel it could compromise data integrity.

Honourable Mentions:

  • SyncBack: supports file compression and can verify file integrity after job completion.
  • Synkron: had a lot of votes for this one in the comments section.
  • File Synchronizer is good if you are looking for a minimalistic or simplistic utility.
Related Products and Links

You might want to check out these articles too:

Quick Selection Guide

Runs as a stand-alone program on a user's computer
Very easy to understand and use "straight out of the box."
Very few filter options, no ftp, no auto sync, very sparse help. Now bundled with unwanted components (OpenCandy).
10.6 MB --> Win32.exe
32 and 64 bit versions available
Unrestricted freeware
A portable version of this product is available from the developer.
Win XP - Vista, Linux
Allway Sync
Runs as a stand-alone program on a user's computer
Very robust set of filters and rules, support for FTP
Monthly file copy limit of 40,000 files, no support for copying locked files
7.1 MB
32 bit but 64 bit compatible
Free for private use only
A portable version of this product is available from the developer.
Win XP - 7

Other languages available


This software review is copy-edited by Ian Richards. Please help edit and improve this article by clicking here.


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by jonrichco on 19. November 2014 - 1:38  (119700)

Yes, it is sad that FFS feels it has to bundle crapware, as the program itself is six star (IMO). Apart from clicking off the installer, my solution to the risk is to take a restore point before installing to be able to remove unwanted software and register entries if necessary. Malwarebytes may also be effective in preventing installation.

by jorgk3 on 18. November 2014 - 22:58  (119687)

FreeFileSync is bundled with Malware!

For FFS there exist two "installers":
This one: (11.1) MB
and this one:

The latter is not the 11.1 MB installer, but some 773 KB helper program. This helper program installs - if you are not very careful and read the fine print - Optimizer Pro and other things. It also downloads the 11.1 MB "real" installer.

Late one night I didn't pay attention and accidentally installed Optimizer Pro and two other unwanted items, one of which was Astromenda, a browser hijacker. It placed itself in about 170 registry entries and was a real pain to remove.

So FFS is great software, but the bundling with malware is unethical.

by LittleSkink on 4. November 2014 - 12:43  (119469)

FFS WatchOut!
an update FreeFileSync is now OFF my machine for good - installed FFS 4.11 today (from SourceForge source) hoping it would fix 4.10. Again being careful to uncheck any boxes as I installed. This time it installed without error but the program fails to sync with any folders or do the job I need it too. It has also hijacked my browsers with some rubbish called Lasaoren and installed some other rubbish called PC Optimser. FFS and Optismer Programs easy to remove, Lasaoren is proving harder

by Anupam on 4. November 2014 - 13:02  (119470)

I think you meant 6.11, since that's the latest version which became available for download today.

I installed FreeFileSync 6.11 on my computer today, and it installed without problems. I was successfully able to avoid the bundled extra that was shown during installation. No extras or unwanted program were installed on my computer.

And I just synced a pen drive containing my software collection with the one on the computer, and again, I had no problems.

So, seems that the problem is local to you. Have you tried uninstalling the software completely, and reinstalling?

While installation, were you careful to avoid the extra software that is offered? It's easy to opt out of.

by LittleSkink on 4. November 2014 - 13:41  (119471)

thanks Anupam, yes 6.11 (doh!)

still not sure how all this rubbish got on my machine, Malwarebytes is still running and has listed 9 suspicious items including OpenCandy too so I clearly messed up somewhere. Given I have Win 7 Pro OS my next step will be to see what sync stuff it can do

Yes I have uninstalled but wary of reinstall, really busy today and don't need the hassle of fixing stuff like this

by LittleSkink on 30. October 2014 - 16:53  (119395)

FreeFileSync has been my "goto" for ages, use it daily to keep my pen drives current. Updated to 6.10 today and Avast reported suspicious adware files and blocked some .exe file writes. Now FFS is broken - running Win 7 Pro and Firefox, anyone else had issues? To be clear, afaik I unticked all the unwanted install boxes at every stage

by Jay Fora on 2. September 2014 - 9:48  (118341)

This site is my first stop when looking for software, I have been helped so many times, and decided to give something back by throwing in my 'two penny worth' I was sorry to learn that Allways Sync now ceases to work after 30 days, unless you buy a license. I never install software bundled with junk, so had to pass on FreeFile sync,and I have forgotten why I passed on the other two on the list. My wish list for a file synch application was very similiar to Gizmo's so I fished around, and found a couple of others that seemed to have good user reviews, and no complaints. One was SyncFolders, the other Dsynchronize. both are free.
I tried SyncFolders first,and found that it does everything on the list, except I don't have a network to try it on...maybe someone else can. It has 3 synch functions - Synch (2 way), copy, or back up. Manual or auto - I could just choose in the settings. I could choose a different function for each folder if I wanted, and several options for each folder to synch however best suits me. Also, there are several choices related to deletions, including transfer of a deleted file or a history folder if I like.Also, options for what I want to happen in 2 way synch if a file has changed in both source and destination folder. There are versioning choices too.
It transferred 15.8Gb to my usb 3 HDD in 9.26 minutes. I don't know how to check for system resources it uses, but I could still use the computer without it slowing down.
I can set it to run as often as I like, 'forever' if I like.
Only thing that is missing for me as a home user, is the option for it to Synch only when I make a change, rather than at set intervals. I've set it for every 10 minutes, because sometimes I can add a lot of files in half an hour, yet sometimes I may not add any for a day or three. Auto is better for me, as I am forgetful. I haven't got around to the other two, because a) I ran out of puff. and b) I would only change now if either of the other two were able to auto synch only when a change occurs. I will see if I can contact the developer of Dsynchronize and ask if it has this option.
Or maybe someone else might have the motivation to check out Dsynchronize before I get around to it.

by SpiderJon on 22. May 2014 - 18:39  (116364)

Based on trying them both with sync'ing 500GB of data between two NAS drives via a Win8.1u PC, SyncBackFree V6 seems a lot faster than FreeFileSync (and SyncBackFree doesn't include Open Candy, either).

by Deperdussin on 17. May 2014 - 18:10  (116256)

I installed FreeFileSync 6.5 on a Windows 7 64-bit Professional system,
opting out of the adware.

After one try I rejected (i.e. uninstalled) it because it took so long
to complete a comparison of two 64GB flash drives. I did not time it,
however, I'm sure it was still working after 5-10 minutes. Back to
FreeFileSync 3.1, which completed the comparison in seconds.

No more will I blindly update a program.

by ryan39d on 10. March 2014 - 8:40  (114920)

The link for FreeFileSync (both the homepage and download page) I think is dead.

by pietervanooijen on 13. April 2014 - 21:34  (115670)

Freefilesynch installs much more ... then you think

Please remove this program from this forum..

This program installs:

c:\program files(x86)\security Update Services\search_checker(as a service)
c:\program files(x86)\security Update Services\winupdsvc.exe

and tries to install a virus detected by the virusscanner in the file pcspeedup.tmp .

Please remove the link to freefilesynch from your forum

Pieter van Ooijen 13-4-2014

by Mike C on 14. April 2014 - 7:09  (115677)

The portable edition from portableapps-dot-com is also excellent. This freeware is very good imo.

by Anupam on 13. April 2014 - 21:53  (115671)

FreeFileSync contains OpenCandy, and therefore, it will show third party software recommendation during installation. Were you careful to avoid that? It can be easily opted out.

I have been using FreeFileSync for a long time now. It's an excellent software. However, you need to just take care during installation to avoid the third party product that is suggested. If you get past that, it installs without trouble.

I don't have the folders or files that you have written about.

by MidnightCowboy on 14. April 2014 - 7:22  (115679)

Agreed these additional items can only be acquired if users just click through the install process.

PC Speed Up is a common candidate among these bundles. MC - Site Manager.

by Anupam on 10. March 2014 - 8:50  (114921)

It's opening fine for me.

by b-ten on 17. November 2013 - 9:53  (112284)

> Very few filter options, no ftp, no auto sync, very sparse help

The filter is actually pretty cool: include/exclude by path supporting wildcards, setting a time span, setting a range of file sizes. These features probably weren't includeded yet when the review was made, so this might need some updating.
It also includes a tool called RealtimeSync which is probably what you mean with "auto sync". The help file has also grown lately and is very useful.

by RandyDoqa on 16. November 2013 - 22:00  (112273)

FreeFileSync contains Opencandy now.

by jonrichco on 17. November 2013 - 20:08  (112304)

5.23 did contain OpenCandy with no visible opt out. However, this has now changed and an obvious click off pops up for Bejewelled Blitz. Open Candy did not appear to install, as it did not appear in Programs and Features, and was easily removed with Malwarebytes.

by MidnightCowboy on 16. November 2013 - 22:19  (112276)

Thank you. The product details have now been updated. MC - Site Manager.

by stanislavf on 31. October 2013 - 21:10  (111919)

Not a deal breaker, but be careful to "unlock" your bitlocker drive if you use this built in encryption on Windows Vista, 7, 8, 8.1.

Spaced on this while using this on two computers and frustrated myself.

by stanislavf on 31. October 2013 - 19:13  (111918)

Probably not a big deal for most people, but this seems to only be installable on the C: drive.

I use a multiple drive system, with a solid state drive for the initial windows load. Thus, my C: drive has very little spare capacity and I TRY and avoid installing on it (rather I put most on the D:\Program Files (x86) or D:\Program Files

Not a huge deal, but something to be aware of.

by PBJ on 29. August 2013 - 23:21  (110402)

>ALLWAY Sync was exactly what I needed for the the job I had.

I work for a non-profit organization who has several independent people working for them with their own personal computers. <

But doesn't the "private use only" EULA disallow that?

by dynamite00401 on 30. August 2013 - 0:05  (110405)

This is from the ALLWAY SYNC web site:


"Non-Profit Customers (but not other Customers) are allowed to use Allway Sync for free, subject to limitations as described below. All other Customers are allowed to use Allway Sync Free for thirty days for evaluation purposes only."

"Non-Profit Customer is defined as a customer who uses Allway Sync in a non-commercial environment for non-profit activity. All Customers who use Allway Sync in a commercial, business or government setting, or in a military institution, or when engaged in profitable activity at home are not Non-Profit Customers for the purposes of this agreement. Customers who are students of accredited universities and high schools are classified as Non-profit Customers even if their school or university is owned and operated by a government."

Since this freeware is designed to be accessed from different devices and different locations, as long as Alway Sync is not being used for profit, it can be freely distributed.

by 6566565 on 29. August 2013 - 22:58  (110400)

> A portable version of this product is available but not from the developer.

The portable installation is in fact already possible with the official FreeFileSync release: There's a checkbox in the installer to do that.

by MidnightCowboy on 29. August 2013 - 23:12  (110401)

Thank you. The product details have now been amended. MC - Site Manager.

by shawnz on 14. July 2013 - 17:28  (109229)

Re: by Geekout on 6. February 2013 - 8:26 (105130)

" Best way to avoid OpenCandy is to block access to their website by
adding it to your hosts file .... and AV/FW blacklists "

This seems like great advice (haven't yet tried it). Should it be posted as an article in a more prominent place?

by dynamite00401 on 20. July 2013 - 20:25  (109431)

Hi Shawnz. Adding information to articles is always considered. Since this catagory has no Editor at this time, how would you like to join our group? You could start the process here. :-)

by ElRicou on 10. July 2013 - 18:14  (109106)

I installed version 5.16 (easily without any unwanted extra software)

The BIG plus I found on this software is that you can ask for the deleted files (the older version of the updated files) to be sent to a specific folder instead of the bin.
That way you can track older versions of a file. For example if I have edited a big Excel file I have been working on for several days, I can roll back to yesterday's version, or the day before or any previous version until the day where the file was created - as far as the "back up" files are kept.

The files are simply copied, so you can access them quite normally from Windows Explorer or whatever file manager or from any machine if they are on a portable device.

I am using it for my work and hold an average of 40 days of work archived (including Outlook's pst file).

Also you can chose to sync as many files/repertories/hard drives as you wish.
You can have several scenarios: i.e. I am saving work files everyday and personal/family files every week-end, I just need to choose which scenario I want to apply in one click.

The choice is now given:
- you can delete old files
- keep them with a date added to the name
- put them somewhere else, without altering the name, in date folders.

That 3d option is my choice, so convenient :)
Thee software is fast, simple, reliable
Just perfect for what I am asking for

by skan on 14. March 2013 - 13:41  (106239)


Can any CVS software (kind of Git, Bazaar, CVS...) be used for the same?

I've being trying all the applications you say in the article and I prefer Alway sync, though is not perfect, I don't like the double scrolling system.

They are not intelligent enough.
I would like some app that show everything as a tree and able to detect not only that something exist in the other folder but also able to detect that a whole subtree/branch/folder with subfolders has been moved to a different place.
Instead of that this applications tell you that something is missing from one place and something is new in some other place but you have to figure out the relations.


by Barrett Linton on 7. March 2013 - 11:12  (106014)

FreeFileSync does modify file names when copying files, for example '-' and German Umlaute such as 'ä', 'ü', 'ö'.

Which Free Folder Synchronization Utility maintains the original file names?

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