5 Ways to Find Duplicate Image Files on Windows PC

Saikat Basu 16-01-2009

If you are a quick fingered photo-snapper or a wallpaper junkie then the thousand of images on your hard drive could be a treasure hoard. But scattered among them could also be a few hundred duplicate images eating up space on your hard drive. Even worse, un-optimized raw images could be eating up chunks of bytes and can be officially called junk.


So, how do we go about covering up our laziness and cleaning up our image folders?

With some free software of course! Here’s a list of 5 software apps (in no relative order of merit) that can find duplicate image files.

Dup Detector

dup detector - find duplicate image files

Dup Detector requires that all images be in one folder. After that it starts with its job by comparing pixel data for each image. It records it all in a data file and finds duplicate images by comparing the closeness of the pixel data. The software starts off by displaying a four tabbed interface – Method, Get Data, Find Dups and View Dups.

The ‘Method’ tab gives you the option to find duplicates in a single photo collection, between two collections or just compare a single image to all images in a collection. ‘Get Data’ enables you to open an existing data file (i.e. a list of images) or build a new data file. The ‘Find Dups’ tab is where you can play around with the matching criteria like percentage match, colour and luminance. The ‘View Dups’ is the results tab displaying the matched images. You can setup the software to do a manual delete, a semi-automatic delete or an automatic delete.


Dup Detector supports the following image file formats – jpg, bmp, png, tif, pcx, tga, wmf, emf, psp.

The installed application has a small footprint of 1.94 MB and can also be downloaded from this alternate site.

Supported OS: Windows XP and 2000 (Not tried on Vista)


duplifinder -


DupliFinder scans and checks image similarities by analyzing the MD5 sum (i.e. the digital fingerprint) of each file. The interface is stark and it lets you browse to your image folder or drag and drop it directly into the program. It lets you check folders or sub-folders for images which are identical and also for photos which are similar. Thus, you might get find related as well as duplicate photos in the results window. The preview helps you to choose which ones to delete. The scan speed is a bit sluggish especially for large image folders but the comparison results are close to the mark.

The 407 KB software runs as a standalone executable and requires Java 1.5.

Supported OS: Windows, Linux




As its name suggests, it searches for “˜double’ copies of all types of files employing any combination of name, size, modification date, or content. You can also employ wildcard searches and filter results using masks or attributes like file size range or files with certain properties like “˜read only’, “˜hidden’ etc.

The results are displayed at the end of the scan and here you can manually or automatically select the files to be deleted. The results can also be exported as a tab-delimited text file which can be imported into a spreadsheet application.

The 793 KB standalone program comes as a free version and also as a paid version with more sophisticated features.

Supported OS: Windows



similar images -find duplicate pictures

SimilarImages finds duplicate images on the hard drive using a “˜graphics library’ which checks the images for compositional similarities. The results depend on a configurable similarity threshold value which can be set by the user or left at the default mark. The program can handle a wide variety of image formats and searches for similarities using the Normal, Inclusive (only within the same source-directory), or Exclusive (Only outside the same source-directory) search modes. The program also has a feature to process only new files by a certain date.

The results window comes with two image panels and includes several actions like deleting one or both files and swapping files (replace one with the other). Using the “˜Semi-automated Deletion’ function one can also pre-select one file from the duplicates counting on the user-configurable rules.

Supported OS: Windows



I usually like to save the best for last and in my humble opinion it is this 1.9 MB software amongst the free bunch. VisiPics employs five image comparison filters to see how similar pairs of images on the hard drive are.

For instance, the software can mark out two identical image files but with different resolutions as duplicates, or the same picture but in different formats and even duplicates where only subtle compositional changes have taken place. Similarity checks can be set using a slider.

Detected duplicates are shown side by side as thumbnails and also in a larger preview window. The images can be flagged for deletion, they can be renamed and can also be moved to another location. The auto-select mode let you choose if you want to keep the higher resolution picture, uncompressed file types, smaller files or all of the above. The single window interface is easy on the eyes and the brain. It is also fast and as the software wiki says about the software – tested on 100.000 pictures, 15 GB archive, full results in 3 hours only.

Supported image formats include JPEG, GIF, PNG, BMP, PCX, TIFF, TGA and RAW

Supported OS: Windows

So if you are a photo buff, which software would be a must-install for you? Do you know of any other free tool which makes hunting down duplicate files free and easy? Let us know…

Related topics: Image Editor, Photography.

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  1. kristop
    November 2, 2018 at 10:55 am

    Thank you for this review. Just a question: are those tools capable of identifying as identical pictures that have been rotated ? (taking maybe into account the cas of the metadata that specifies the correct orientation without actually rotating the content... Complicated subject I've never been able to clear out !)

    • kristop
      November 2, 2018 at 3:37 pm

      I just tried Visipics, and there is an option for rotation, so I'll try this one more in depth.
      I wonder if there is more sophisticated options to mark the picture to delete, such as is a specific name has been used instead of the standard CIMGXXXX format of the camera... I'll check on other tools for that.
      Thx anyway!

  2. Elijah brock
    April 15, 2018 at 4:48 am

    The best solution that I can suggest by using duplicate files deleter because this programs can find out two or more duplicate images of the same file which may be stored at different locations,helps you to find the exact locations of your file and you can saved space if you remove files.

  3. Kat? Riku
    February 5, 2018 at 4:53 pm

    All these software are now very old and few of them are no more working on windows 10!
    Fortunately the new software generation is ready!

    My favorite tool is Duplicate Media Finder.

    It's the most user-friendly software. Duplicate Media Finder is as simple and efficient as possible. In Japan it is very popular.

  4. Pamela Bourque
    January 7, 2018 at 8:02 pm

    Visipics is good. But, God , the size of the thumbnails are ridiculous! The creator says that to have larger ones it would be a much larger app. Um... Who the hell cares? not me!

    And in auto, It doesn't always pick the larger, better image. I thoroughly resent having to still go through each one to check. It's a useless function at that point.

    I have entirely to many to go through to it a pair at a time. Why can't I just find one that has visable, recognizable, thumbnails that will auto choose bigger files?

  5. Clem Anderson
    August 21, 2017 at 1:22 pm

    The article is really informative, however, I use Duplicate Photo Finder. It works on the basis of similar pixel photos and segregates them first. The software is so advanced that it can identify images that are flipped, rotated, edited or even taken from different settings of the camera.
    The tool also has a Selection Assistant which helps you remove photos by groups, dates, drives and folders. It is really easy and fast to remove the files that you do not need.
    Moreover, you can preview what to delete and what to keep side-by-side through the built-in image preview. It makes your task more effortless.
    So for uncomplicated and painless removal of duplicate photos, you can consider Duplicate Photo Finder.

  6. Dustin
    August 7, 2017 at 12:46 pm

    I use DuplicateFilesDeleter and it showed great results :)) 5.8.5 is great version, 100% cleaning doubles, and also 100% free :))

  7. Don King
    January 15, 2017 at 3:33 am

    I've been using VisaPics for quite some time now,, and am sold on it . Great little program.

    • Saikat Basu
      January 22, 2017 at 6:44 am

      Yes, and for a tiny program it is still going strong!

  8. Efecan
    January 11, 2017 at 11:41 am

    Hello, thanks for the nice article. I need a software that I can compare an image file with the rest of a folder. Is there anything like this?

    • Saikat Basu
      January 29, 2017 at 4:25 pm

      Just one image file with the rest of the images in the folder? Nothing comes to mind. But what is the usage reason behind this, if I may ask?

      • Gary
        December 8, 2017 at 1:57 am

        The usage reason for such an application should be obvious. I just ran a duplicate image deleting program for a few hours and I want to be proactive and not ADD any new duplicates.

        The ideal software would allow me to click on an image on the internet and then search a database of all my pictures and tell me if I already have an identical or similar copy of that image. Then I could either skip it or replace my current image with this one. I would settle for having to download the image to a temporary location first, let the software do the search and then I could either keep or delete the new image.

        I found a free program that can do a single duplicate image search, using the latter method. It is called ImgSeek ( and it works with my 32bit, Windows 7 system. Unfortunately, it was last updated in 2013 and may no longer be supported.

        It even claims to have the ability to match an image with a rough sketch that you make, which would prove useful if you can remember a picture that you have, but you can't remember its name or where you put it. I haven't tested this feature yet.

        Perhaps someone knows of other software (free or otherwise) that can do these things.

    • Andy
      February 19, 2017 at 8:56 pm

      DupDetector can... under METHOD choose the bottom one.
      Compare single image to primary datafile (no comparison within the datafile)

      Been using Dupdetector for a few years... it can compare more than 1 folder...
      the datafile can be main folder + subfolders.
      For searching more than one folder use the IMAGELIST.exe
      In dupdetector file > open imagelist. then add the folders and subfolders of your choice.
      There is a limit in Dupdetector of 1000 dups by default which can be changed.
      Find Find Dups Setup..(method and restrictions) change the default 1000 to whatever you like.

  9. Don King
    August 26, 2016 at 12:47 pm

    SimilarImages just took me to a porn site.

  10. BADJAG
    August 16, 2016 at 9:32 am

    I found DoubleKiller to be the best of the lot. AWESOME speed - took just a few seconds for scanning 500+ images. It makes use of the CRC32 checksum, so exact duplicates of ANY file type can be found. The interface takes a minute to understand, but a manual is built into the programme. The best part - a simple standalone EXE, no installation required. That's how a utility should be - simple, ULTRA fast, and free!

    The only drawback is that it can find only EXACTLY identical files, so it can't be used to locate similar images with different pixel sizes, for example. But it's versatility makes up for everything else - you can even find identical MP3 songs if you want! 5 out of 5 stars!

    • BADJAG
      August 16, 2016 at 9:35 am

      How silly of me - forgot to say thanks for this handy article. :)

    • Saikat Basu
      August 21, 2016 at 7:09 am

      Thanks for the recommendation. Looking into it.

  11. Gilles
    May 28, 2016 at 8:30 pm

    dupeGuru from Hardcoded software is Free and really good !

    • Saikat Basu
      May 31, 2016 at 11:42 am

      Wil check it out. It has a Mac version too. Thanks for the suggestion, GIles.

  12. Lesphirou
    February 4, 2016 at 7:28 am

    I only tried this VisiPics and it is really good. Very fast and accurate, and it shows precious information about the duplicates, like: resolution, file size, file name, date... I have a lot of fanarts and artworks saved on my HDD, so these little informations can make difference on choosing what duplicates should I delete.
    Thanks for the tip

    • Saikat Basu
      February 4, 2016 at 9:05 am

      Thanks Lesphirou.
      It's a wonder how many tons of duplicates we stow away on our drives after a few years.

    • Jayden Benjamin
      April 11, 2016 at 2:56 pm

      I would recommend you to try Duplicate Files Deleter program.

      • Saikat Basu
        April 12, 2016 at 3:11 am

        Thanks. Will check it out.

  13. Sam
    May 3, 2015 at 8:57 am

    You are an ass. Puting Dup Detector at the top of your list, and making people download a complete piece of shit program, which does not do anything at all, but only corrupt the PC. I don't know what to call you spammer or phisher..... Go and do something useful!

    • Anonymous
      July 10, 2015 at 5:23 am

      Hi Sam, Try Using VisiPics for sure it won't disappoint you any more. I'm using it morreOften

    • Anonymous
      August 28, 2015 at 2:01 am

      I think you may be confusing the man in the mirror for the web author. No one made anyone do anything. You downloaded the first on the list without reading the entire article which clearly says that he saved best for last per his nature.

      Apparently you just grab stuff without thinking and because you dont think blame others for the results.

      Get a life.

    • Anonymous
      September 20, 2015 at 9:36 pm

      It just common sense to look at the date of when the article was written.
      It was written before windows 7.
      I didn't download it because I noticed it didn't support windows 7.

      "Supported OS: Windows XP and 2000 (Not tried on Vista)"

  14. karinaop
    March 19, 2015 at 8:16 pm

    Interesting tool!! Other than this, One of the interesting tools that I found recently is DuplicateFilesDeleter.It is tool that can be used to find & remove duplicate files. It is a simple to use, but very effective tool to locate duplicate files in one or more selected search paths. It scans the files and compares them based on Byte for Byte Comparison, which ensures 100% accuracy. You can then choose to delete the selected duplicate or original files. The program is multi-threaded which enhances the performance immensely & performs scans very quickly. Worth trying.

    • Saikat
      March 20, 2015 at 4:24 pm

      Thanks for the recommendation. Will check it out.

  15. Hulk Pictures
    January 8, 2010 at 5:24 am

    Based on your recommendation I tried out VisiPics and love it!

    Just started a picture site and this is saving loads of time and eyestrain from finding duplicate pics :)

    Thanks Saikat!

  16. Elizar
    October 17, 2009 at 9:38 am

    exactly what i was looking for! thanks!

  17. Allan Cass
    February 2, 2009 at 5:29 pm

    Sorry my mistake then :)
    This one is pretty good and free:
    Fast Duplicate File Finder
    It scans all duplicates, not only images.

  18. Saikat
    January 26, 2009 at 10:19 pm

    Actually, we cover only free apps. There are a lot of good paid software out there. This one is among them. Thanks for the info though.

  19. Hector
    January 18, 2009 at 4:33 am

    I found the VisiPics one very useful, got rid of some dups.

  20. Ariel
    January 17, 2009 at 11:28 pm

    Um, HELLO?! Ever heard of Picasa 3? On my Mac (take note, Sandra) I used Picasa to find almost one gigabyte of duplicated photos.

  21. sandra johnson
    January 17, 2009 at 10:44 am

    I could really use one of these downloads. Is there one for Mac?
    I have hundreds of duplicate photos and don't have the time to delete them.

    • Rich
      January 12, 2010 at 7:40 am

      For iMac use Duplicate Annilator. Does the job at only $7.95

  22. Find Duplicate Files
    January 17, 2009 at 4:11 am

    Another program that can find duplicate files is Clone Tools. It does also find duplicate and similar folders.
    Clone Tools

    • Aibek
      January 17, 2009 at 4:15 am

      Clone Tools is NOT FREE!!!

  23. oso
    January 16, 2009 at 7:25 pm

    great selection of apps... would you recommend a similar application that also finds duplicated music files?

    • Saikat
      January 16, 2009 at 9:31 pm

      DoubleKiller mentioned here does the does iTunes and it's a free download too.