AllDup is a powerful duplicate file finder for Windows

Martin Brinkmann
Mar 10, 2015
Updated • Mar 10, 2015
Software
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24

Depending on how you use your computer and download and transfer files, you may end up with a large collection of files on it.

If you prefer to download in bulk for instance, then you may end up with duplicate files. The same is true if you have a large collection of files, for instance music or pictures, then it may be difficult to keep an overview of what you have and what you still want which may result in duplicate downloads as well.

Going through a collection of thousands of pictures or music files manually is not really an option as it would take a long time to do so.

That's where programs like AllDup come into play. It is a portable program for Windows that scans alle files in directories that you specify for duplicate contents.

The usefulness of a duplicate file finder lives and falls with the search criteria that it offers. A program that can only search for duplicates based on file names for instance will skip duplicates that have different names.

AllDup ships with eight different search options that you can combine. It is possible to search by name and extension, but also by size, content (byte to byte), attributes, file modification and creation date, or hard link.

If you select file contents, you get additional customization options that allow you to ignore id3 and exif data.

Once you have made your selection there, you select one or multiple folders that you want scanned by the program. It is possible to go all in and select all root folders of all drives and partitions connected to the system but that is usually not a good idea.

First, it takes way to long to scan all those files for duplicate and second, you will get hits in Windows folders which are better left alone. The program scans all subfolders automatically.

Before you hit start, you may want to go through the search options, file and folder filter menus as they hold interesting options as well.

Search Options for instance allows you to enable the scanning the contents of zip and rar files, and to exclude files that are larger or smaller than a defined size.

File and folder filters on the other hand allow you to exclude files and folders from the scan, or turn things around and only include select files or folders in the scan.

The program scans only the following file types by default: bmp, gif, jpeg, jpg, mp3 and png. While that speeds up the scan, it ignores other file types you may be interested in such as flac, doc or avi.

The results window looks like an icon editor on first glance as it displays several icon toolbars at the top.

duplicate files

Move the mouse cursor over an icon to get a tooltip which hints at what it does. Probably the most useful ones are the file selectors in the last toolbar as it enables you to automatically select files. A click may select all files but the first one for instance or all files but the one with the shortest name.

Other filters of interest allow you to remove files of select folders from the listing or expand all groups automatically.

Once you have select one or multiple files you right-click on the selection to display a context menu with options to delete the selection.

The context menu displays other options, for instance to add a file to the ignore list, to open it on the local system or to select all files of the same path as well.

Search results can be saved and exported to a txt or csv file. If you save search results you can load the results at a later point in time.

It will take some time before you get used to all the features that the program offers. While it is possible to ignore most of them and get great results, it is necessary to go through some of the menus such as file filters before you run scans as you may end up with no or only partial results otherwise.

Two areas could use improvement: first, the preview option is handy as it shows a preview of the file directly in the interface when enabled. While that is the case, only one preview is shown at a time. It would be useful if you could display two images side by side to determine if they are indeed identical or which has the better quality.

Second, an option to match partial file names as well.

With all that said, AllDup is an excellent powerful duplicate file finder for Windows.

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Comments

  1. Klaas Vaak said on December 26, 2020 at 12:30 pm
    Reply

    @Martin Brinkmann: with all due respect, this is now such a basic function, esp. for people reading your articles, that this article is like explaining to the readers how to calculate 1+1.

    1. Herman Cost said on December 26, 2020 at 2:56 pm
      Reply

      Yes, I have to agree with this. I can’t imagine that there are many spreadsheet users who are computer literate enough to even casually read ghacks, but don’t know how to use a SUM function.

    2. Malte said on December 26, 2020 at 4:05 pm
      Reply

      @Klass Vaak & Herman Cost
      Ever thought that people might google it so this artice might show up in the search results. So..no it’s not useless. I think it’s a good strategy explaining stuff even if it’s just basic things. Every day there is a new user on the internet searching for this kind of tutorial.

      1. Klaas Vaak said on December 26, 2020 at 6:55 pm
        Reply

        @Malte: you make a good point, in principle. Nevertheless, nowadays telling people how to do a sum calculation, the simplest of the simple, in a spreadsheet is like teaching grandma to suck eggs.

        If say an elderly person would be sitting in front of a spreadsheet wondering how to sum a number of cells, that person is unlikely to look it up on internet, but would ask one of her/his children.

        And in any case, Ghacks is not a spreadsheet tricks and tips site, so it would not show up high in the ranking in a Google search.

      2. marty said on April 11, 2022 at 1:42 pm
        Reply

        I`m an elderly person. 71.
        My experience in computers spans 50 years, focused on Unix internals, advanced degrees.
        I look to the internet for answers, since my children hate me and wouldnt tell me “jack”, even if they knew the answer.
        I dont know how to “suck eggs in principle”, or anything else for that matter. I’m retired and not interested in learning. Some other guy learned “the theory of sucking things.”

        Never needed spreadsheets, always too darn busy. Thanks for this info. Now I know how to sum two cells.

        Everyone starts somewhere.

      3. yanta said on September 10, 2023 at 9:34 am
        Reply

        I am an elderly person and I can use sum, sumif, sumifs and so on. My kids come to me for knowledge on how to use excel and other programs ;)

        But then, I was in IT my entire career before I retired :)

        There are basic sites, and there are advanced sites. GHacks used to be more for people with technical knowledge. You can’t be everything to everyone though that seems to be the trend these days. Since it’s all about clicks and click bait the wider the topics the more you can remain “relevant”…

        However, that mentality tends to alienate the more technical people. I find myself spending less time here every month. It won’t be long before I stop coming here altogether.

        I have no mobile or wireless technology.

        Anything google or apple is insidious to me. And that accounts now for most of the content here.

        As to this article. Avast, and all of their products are untrustworthy. There has been much controversy and negativity regarding their products. I would think a reputable site would be more careful in what they publish… err, sorry, advertise.

    3. Peterc said on December 27, 2020 at 1:22 am
      Reply

      @Klaas Vaak: In Martin’s defense, it’s the day after Christmas, and some eggnog recipes pack a *real wallop*. Maybe we’re lucky he could type at all. ;-) More seriously, I don’t use Calc super-often, I typically type in the =SUM() function manually, and I’d actually *forgotten* where the Σ button is located in Calc. (The last time I was a heavy spreadsheet user, it was in an older version of Excel and I’m pretty sure the Σ button was somewhere on one of the “regular” toolbars.) So, the article actually did have a small payoff for me. Plus, there might be other intermediate or advanced users of other types of programs (graphics, audio, video, word-processing) who have never used a spreadsheet in their lives. It’s kind of hard to imagine, I know, but it’s possible.

    4. pHROZEN gHOST said on September 5, 2023 at 2:47 pm
      Reply

      You were not born with the knowledge you have now. You once had to learn too.
      So get down off your high horse, grow up and show a little respect for others who need details.

  2. SpywareFan said on December 26, 2020 at 12:48 pm
    Reply

    Overall LO has become a good SW, what prevents me to use it is:
    https://wiki.documentfoundation.org/Development/Calc/XMLSource
    “it will not store the information about the data source once the data is imported”
    Until that functionality is implemented I’m forced to use M$ Office (2003).

    1. Klaas Vaak said on December 26, 2020 at 3:05 pm
      Reply

      @SpywareFan: an interesting alternative for M$ Office is Softmaker’s FreeOffice.

      1. intelligencia said on December 26, 2020 at 10:02 pm
        Reply

        @Klaas Vaak

        I have the Softmaker’s Free Office Suite in my computer – – and I LOVE IT!

        intelligencia

      2. SpywareFan said on December 27, 2020 at 11:18 am
        Reply

        In the FreeOffice manuals there is no reference to XML data mapping functions.

    2. Kent Brockman said on December 27, 2020 at 8:01 pm
      Reply

      Another vote for Softmaker’s Free Office, a very nice alternative to MS Office.

  3. Anonymous said on December 26, 2020 at 3:03 pm
    Reply

    Yes, I use functions in Calc: Average, Min and Max. I use the mouse to select the cells.
    I don’t usually have to use Sum.
    Thanks for the info, and could we have more tips for LibreOffice?
    I find that the documentation does not keep up with the changes in LibreOffice.
    Also, it is hard to find info in the help documentation.

  4. Bart from Holland said on December 26, 2020 at 9:29 pm
    Reply

    Thanks Martin for all your great work you put in to make our live easier. Have a nice and healthy 2021.

  5. ShintoPlasm said on December 26, 2020 at 11:09 pm
    Reply

    To all those complaining about this being a simple ‘101’ function: it’s Martin’s blog, he can write a deep-dive review of Windows Calculator if he so wishes. Do you pay his salary or something?

    1. Klaas Vaak said on December 27, 2020 at 5:27 am
      Reply

      @ShintoPlasm: yes, it is Martin’s blog, but it is a public blog with a comments section, which means he invites people to comment. And having been an avid reader for several years now, I am pretty sure Martin does not expect commenters to agree with him all the time.

      You do not help him with agreeing with everything willy-nilly and “honouring” him with praise. Martin, like everyone else in the world, is not perfect, therefore he can only learn from constructive criticism.

      Unfortunately you look at constructive criticism as a complaint. I do not agree with you on that and will keep making constructive criticism because I believe in keeping this website one of the best ones – refraining from constructive criticism won’t do that.

      1. Kent Brockman said on December 27, 2020 at 7:59 pm
        Reply

        Absolutely. People could rather than leaving constructive criticism just stop visiting the site. How is that in the best interest of the site’s authors?

  6. Anonymous said on December 30, 2020 at 9:35 pm
    Reply

    A new way to sum with the latest version is to place the cursor under the numbers to be summed, then press Alt-=, then ENTER.

  7. Pat said on April 19, 2021 at 6:23 am
    Reply

    The SUM function doesn’t work. It just keeps putting the same total no matter what figures I enter.

  8. Mary said on March 23, 2022 at 11:42 pm
    Reply

    I would like to know how to make the sum function work. I know how it should work and it works in excel. But when I put the sum function in, it will not make changes when I edit and change the data, the total remains the same

  9. will willows said on July 26, 2022 at 5:41 pm
    Reply

    Ditto, Marty. Everyone starts somewhere. Thanks.

    1. Anonymous said on September 29, 2022 at 6:04 pm
      Reply

      Instead of being snarky, maybe you could be helpful. I’d like to add two numbers in a cell;
      In Excel, it would be
      =5+6

      I try that in this piece of crap software, and get a message “Invalid value.”

  10. semce said on August 23, 2023 at 1:52 pm
    Reply

    I used Excel a lot when I was working. Retired now seven years. Excel was great, especially for macros. I now use LibreOffice, which works similarly but the macros are difficult in comparrison to Excel. I couldn’t find anything on macros for Free Office, which was disappointing, so I uninstalled it. I find Zoho to be the most similar to Excel but there you’re stuck with your spreadsheets in the cloud which I didn’t like.

  11. Graham said on August 24, 2023 at 1:44 am
    Reply

    Um… When was this article posted? The date says today (August 23, 2023), but I’m seeing comments from 3 years ago.

    1. Anthony said on August 24, 2023 at 5:04 am
      Reply

      I was going to amuse myself and check out the comments for this Avast AV sponsored post since there were so many comments. I thought it funny since they have an article bashing the product in 2019.

      What do I see when I go to the comments? Ghacks pulled an “Amazon” and replaced an article on Excel SUM functions with a sponsored post to make it look like a good article.

      Anyone and everyone who even has a clue about tech knows that Avast is utter garbage and focuses on spying on you and spamming you with ads these days. Just check out the bad article from 2019 on this very site! If you run Windows 10/11, you already have better antivirus than Avast built-in to Windows.

  12. awf said on August 26, 2023 at 7:33 am
    Reply

    @graham
    surely more importantly is why an ad for dodgy anti-virus has the whole thread on office suites instead.. something in the db is messed up.

  13. Kirk said on September 1, 2023 at 5:33 am
    Reply

    On a slight tangent, does foobar2000 have a built in lyrics plug in? I mostly used Linux and Deadbeef, the closest alternative to Foobar there has a very old(and kinda broke) plug in.

  14. News filter said on September 1, 2023 at 4:04 pm
    Reply

    If you want news then add this line in uBlock Origin:

    ghacks.net##.hentry,.home-posts,.home-category-post:not(:has-text(/Martin Brinkmann|Mike Turcotte|Ashwin/))

    1. owl said on September 2, 2023 at 1:27 am
      Reply

      @News filter,
      > ghacks.net##.hentry,.home-posts,.home-category-post:not(:has-text(/Martin Brinkmann|Mike Turcotte|Ashwin/))

      Thanks for the useful information.
      Added line to My filters in uBlock Origin.

      Magnificently,
      I was able to clean up “all articles” by other authors on the Ghacks site.

      It’s refreshing to be able to see only useful articles (instead of being buried among inferior articles) by clearing out the obtrusive articles.

  15. Anonymous said on September 4, 2023 at 1:04 pm
    Reply

    Important note: changing policies through the program doesn’t save them automatically. You need to hit Ctrl+S (or go to File > Sve Policies)

  16. Zaqzyp said on September 5, 2023 at 12:56 pm
    Reply

    What silly click bait article. Even the actual article is ridiculous.

    “The launch of HarmonyOS for PC could pose a serious threat to Windows.”

    Who cares what people in China use.
    Don’t do drugs before working maybe.

    What’s next? Look up the biggest Android fork in China and write pointless long article about it how it’ll take over Google’s Android.

    1. Zaqzyp said on September 5, 2023 at 1:00 pm
      Reply

      HarmonyOS and Excel comments are mixed up.

  17. Anonymous said on September 5, 2023 at 1:13 pm
    Reply

    HarmonyOS is not an open-source OS, only partially components.

    P.S.
    What is happening with these comments from other articles?

  18. awd said on September 5, 2023 at 1:14 pm
    Reply

    this is funny. it looks like the same base article, comments and all has been repurposed and edited or something for 3 (or more) different articles.

    started off as something for some office suite… and then it was some antivirus thing.. and now it’s some iffy os.

    wtf is that writer doing? no one reads or comments on the ad articles and he has to reuse old ones to make it look like it’s getting traction? (though it shows up as 0 comments on the homepage, so that can’t be it?)

  19. dial said on September 5, 2023 at 2:34 pm
    Reply

    “HarmonyOS does not have Google. Huawei’s HarmonyOS is a proprietary operating system..”
    vs
    “HarmonyOS is open-source, which means that it can be customized by developers and manufacturers.”

    Both are quotes from the article. So which one is it, open source or proprietary?

  20. Winnie said on September 5, 2023 at 4:01 pm
    Reply

    Without windows-based videogames able to run, it’ll stay niche.

    Huawei better put serious money into a harmonyOS port of Wine, DXVK or Proton if it wants its machine being more than web browsing thin clients.

  21. John G. said on September 5, 2023 at 4:14 pm
    Reply

    I won’t trust a foreign OS.

    1. John G. said on September 5, 2023 at 4:16 pm
      Reply

      Deeply foreign, I meant. In so many ways.

    2. Anonymous said on September 18, 2023 at 2:00 pm
      Reply

      “I won’t trust a foreign OS.”

      You trust Microsoft Windows, Google Android and Apple operating systems just because they are from businesses in your country ? Talk about blind nationalism.

      Do not forget also that there is a world outside of USA and that for most of human beings, your favorite operating systems are also of a foreign origin, and as hostile towards them as they are towards yourself.

  22. wibble said on September 5, 2023 at 5:07 pm
    Reply

    HAHAHAHA – did you really say “it could pose a serious threat to Microsoft’s Windows operating system”?

  23. Anonymous said on September 5, 2023 at 5:21 pm
    Reply

    It won’t run programs or real games, so it will be useless.
    I mean, there are some people who apparently love using tablets and phones for everything, but mostly are people who will barely do anything with their brain in life.

    I mean, even if Photoshop, and others are available for iPad, do people think iPad is a threat for windows? not really, maybe for useless consumers who will just, like with a phone, be happy and move on, but not for professional industries which are the ones who matter the most, because are the ones who generate more revenue, since they buy the most expensive hardware and software.
    Nothing consumer computing related really makes much money, unless it is data from users that get sold for AI or Ads.

  24. vanp said on September 6, 2023 at 6:10 am
    Reply

    Who knows where this comment is going to wind up. It’s in response to the article about Huawei’s HarmonyOS (HOS) operating system.

    Two places in the article it says HOS is open-source. One place the article says HOS is proprietary. Uh, I’m pretty sure it can’t be both. Which is it? If there’s some fine distinction, somebody needs to explain it.

    1. Jody Thornton said on September 7, 2023 at 1:52 am
      Reply

      After all of these issues with Ghacks articles and misplaced postings, I’m reminded of this

      https://www.ghacks.net/2019/10/07/ghacks-has-a-new-owner-and-that-is-a-good-for-everyone/

    2. owl said on September 7, 2023 at 8:22 am
      Reply

      @vanp,

      Note: I replied to you on September 6, 2023 at Around 2:20 pm, but it was still remain blocked after more than half a day, so I replaced the quoted URI scheme: https:// with “>>” and reposted.

      The current ghacks.net is owned by “Softonic International S.A.” (sold by Martin in October 2019), and due to the fate of M&A, ghacks.net has changed in quality.
      >> ghacks.net/2023/09/02/microsoft-is-removing-wordpad-from-windows/#comment-4573130
      Many Authors of bloggers and advertisers certified by Softonic have joined the site, and the site is full of articles aimed at advertising and clickbait.
      >> ghacks.net/2023/08/31/in-windows-11-the-line-between-legitimate-and-adware-becomes-increasingly-blurred/#comment-4573117
      As it stands, except for articles by Martin Brinkmann and Ashwin, they are low quality, unhelpful, and even vicious. It is better not to read those articles.
      >> ghacks.net/2023/09/01/windows-11-development-overview-of-the-august-2023-changes/#comment-4573033

      By the way, if you use an RSS reader, you can track exactly where your comments are (I’m an iPad user, so I use “Feedly Classic”, but for Windows I prefer the desktop app “RSS Guard”).
      RSS Guard: Feed reader which supports RSS/ATOM/JSON and many web-based feed services.
      >> github.com/martinrotter/rssguard#readme

      Regarding “Huawei’s HarmonyOS” you asked about, the developer has stated that it is planning to open source, however the actual situation has been shelved (no such movement).
      HarmonyOS – Wikipedia
      >> en.wikipedia.org/wiki/HarmonyOS
      Therefore, it is “proprietary software”.
      Moreover, both the company and its production base are in China. China, Russia, Israel, etc. are “Authoritarian state” and products and companies based in those countries are under state control, and privacy policies can become “famous and innocent.” Those products should be avoided.

      1. owl said on September 7, 2023 at 9:20 am
        Reply

        Correction of sentence
        Before correction: “famous and innocent.”
        After correction: “nominal name only titular.”

      2. vanp said on September 8, 2023 at 5:29 am
        Reply

        owl, thanks again for the great info.

  25. Dennis Faucher said on September 8, 2023 at 4:12 am
    Reply

    HarmonyOS doesn’t run Windows apps. It is no threat to Windows.

    1. Glyde said on September 8, 2023 at 8:06 pm
      Reply

      I agree.. i bet it cant even run wallpaper engine, it probably has the worst compatibility with software.

  26. hira said on September 9, 2023 at 9:24 am
    Reply

    iam vary satisfied this work
    http://crackscoop.com

  27. yanta said on September 10, 2023 at 9:36 am
    Reply

    ah, wonderful, this message/article cross-posting hasn’t been fixed.
    Ignore my comments.

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