[Windows] Remove duplicate files from your computer with AllDup

The chances of your computer having duplicate files, be it due to installation of programs or creating documents, is high once you have used the computer for some time. It is often difficult to identify what is a duplicate file and what isn’t. This is where a program like AllDup is useful.


Main Functionality

AllDup is a free software that scans for, finds, and deletes duplicates of any type of file on your computer.


  • Scans and removes duplicate files
  • Provides multiple criteria to use to find duplicate files, including byte-by-byte analysis
  • Can add an entry to right-click context menu for on-the-go scanning
  • Duplicate files can either be deleted permanently, sent to Recycle Bin (i.e. deleted temporarily, copied, moved, or renamed
  • Is portable
  • Fairly fast


  • Necessitates scanning individual files before it decides which of them are duplicates (i.e. double scanning)
  • Has a slight learning curve thanks to poorly designed, busy interface


AllDup is a very useful software for those who have a large amount of data on their hard drives and have no idea how to find out whether there are duplicate files on your system. AllDup developers offer two options for downloading the program, an installer version and a portable version. After downloading your preferred version and launching the program, you will be presented with a fairly simple user interface.

To start a scan, simply select the location that you want AllDup to search, tick whether you want the program to search sub folders as well, specify the search criteria, and press Start Search near the top right corner. AllDup quickly scans the drive and presents the files that it thinks are duplicates.The search criteria that you can assign are File Name, Extension, Last Modified Date, Size, Attributes, and more.

After selecting the files which you believe are duplicates, simply press the File Manager button which is located just below the menu bar at the top. You will then be presented with various options that you want the program to perform, such as delete the files, move them to a separate folder, rename the files, or remove them to the Recycle Bin.

One thing to keep in mind when using AllDup is that the genre of duplicate file finding is inherently flaws. The reason being is often times duplicate files are necessary for the proper function of programs. For example, two programs may have the same DLL file in their folders because both need it. If you were to remove one of the DLL files, one of the programs would stop working. AllDup is no exception to this rule. While AllDup while find files it thinks are duplicate, it has no intelligence so it cannot tell you if the duplicate files are removable or necessary — it is up to you to decide if you should remove the files or not.

Also, keep in mind when searching for duplicates is that even if both the name and file extensions are the same, it does not mean that they are duplicates of each other. Hence it is always important to open the duplicate files or the file location before deciding to mark them as duplicates.

One tip I have when searching for duplicate files is to not search your whole C:/ drive. Rather, only search locations where you, or other users of your computer, store files — such as your Documents or Downloads folders. Only searching user-controlled locations cuts down on the chance of you accidentally delete duplicate files that should not be deleted, namely the ones in Program Files.

Conclusion and Download Link

AllDup is an excellent software to remove the duplicate files that you have and to free up additional space on your system. However the program is not completely perfect; namely, it still bears the flaws of all its brothers — the inherent problem of accidentally deleting duplicate files that are not meant to be deleted. Use it properly and AllDup is extremely useful; use it improperly and you are in a world of hurt.

Price: Free

Version Reviewed: v3.4.13

Supported OS: Windows 2000/XP/2003/Vista/Server 2008/7

Download Size: 3.36MB

VirusTotal Malware Scan Results: 0/42

Portability: Is portable (installer version also available)

AllDup download page

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  • manyprog

    I have used this program to find duplicate photos in my collection. The program is good, but slow. Therefore, use Duplicate Remover Free http://manyprog.com. Functional it is small, but it works fast.

  • keving

    we can also use DuplicateFilesDeleter to find and delete all type of window, mp3 duplicate data.

  • If you want to remove/ delete this file from your hard drive so download quickly “Duplicate Files Delete” from http://DuplicateFilesDeleter.com. It may be able to be removed/ delete this file from your hard drive.

  • THanks Vinay, and

    JUST what I was looking for today!
    So nice to see something that isn’t just a replay of the “brochure”.
    I’m downloading it as I write!

  • Eric989

    Yes, this is the best duplicate finder I have found. Even though it uses the byte by byte method, it is still fast. I think it probably just searches a certain number of bytes or until it finds a difference. Whatever it does, if was faster than I expected.
    It even allows you to save your scan results so you don’t have to delete the duplicates immediately after they are found.
    It has a somewhat complex UI as stated in article but that is pretty much necessary for a program like this. Still it could be a little clearer.
    I like that it has a confirm before delete feature, but you can turn it off if you want.
    I agree to not search too many folders at once. If you are getting a lot of duplicates from a few folders, I suggest redoing the search on just those folders. For me it is much easier if I break it down into smaller pieces.
    Another hint. Don’t delete any dlls unless you for sure know what you are doing. In my experience dlls will clog up your entire search results if you do too broad a search. I suggest using the file filter to exclude dlls in most situations.
    Almost forgot. It also has the ability to create hard links instead of deleting files outright.