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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.

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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 -

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

DoubleKiller

DoubleKiller

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

SimilarImages

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

VisiPics

visipics

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…

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

    SimilarImages just took me to a porn site.

  2. 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.

  3. Rea Teza
    August 8, 2016 at 3:53 pm

    Try PhotoDeduper, it's very easy to use.

  4. 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.

  5. 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.

  6. 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!

    • Pratik Parmar
      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

    • John E. Durrett
      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.

    • Michael McCord
      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)"

  7. 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.

  8. 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!

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

    exactly what i was looking for! thanks!

  10. 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.

  11. 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.

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

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

  13. 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.

  14. 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

  15. 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.
    See
    Clone Tools

    • Aibek
      January 17, 2009 at 4:15 am

      Clone Tools is NOT FREE!!!

  16. 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 job..so does iTunes and it's a free download too.

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