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Files - Duplicate Checkers (12)

AllDup v4.4.3 Updated

billon on 31 Jul 2019
  • 8MB (uncompressed)
  • Released on 31 Jul 2019
  • Suggested by guinness

AllDup removes duplicate files from one or multiple directories and includes a preview function using Windows own tools (IE, MediaPlayer and WordPad). Can find duplicates by file name, file extension, file content, file dates, file attributes. The software can also scan ZIP or RAR archives (with an optional file size limit) and filter file types and/or folders.

System Requirements: WinXP / Vista / Win7 / Win8 / Win10
Writes settings to: Application folder
Stealth: ? Yes
Unicode support: Yes
License: Freeware
How to extract: Download the "Portable Edition" ZIP package and extract to a folder of your choice. Launch AllDupPortable.exe.

Optionally, delete unnecessary language files.
What's new? See:
Latest comments
webfork on 2013-02-16 20:12

@Prime: Unknown. Anyway, just rechecked the status and the current license info is correct.

MIKLO on 2017-10-12 15:04

Working as "freeware" for me :) very nice software does all I want and more thanks for job well done.

Special on 2018-12-23 20:30

It seems that with v4.2.0 it now phone home no matter what on every startup, 4.1.8 didn't do this and yes, the option "Check for updates on startup" is disabled.

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CloneSpy v3.42

billon on 13 Oct 2018
  • 6MB (uncompressed)
  • Released on 13 Oct 2018
  • Suggested by Fluffy

CloneSpy can help you free up hard drive space by detecting and removing duplicate files with exactly the same contents regardless of their name, date, time, or location. Also, CloneSpy is able to find files that are not exactly identical, but have the same file name. This can be an issue for example if you have different versions of a file and you want to find and remove the older versions. CloneSpy is able to find zero-byte files.

Note: The installer now allows you to choose between a 32 or 64-bit version of CloneSpy.

System Requirements: WinXP / Vista / Win7 / Win8 / Win10
Writes settings to: Application Folder
Stealth: ? Yes
Unicode support: Yes
License: Freeware
How to extract: Download the installer and select 'portable version' at installation type. Launch CloneSpy.exe.
Similar/alternative apps: DoubleKiller
What's new?
  • Added:
    • Folders can now be scanned non-recursively, i.e., sub-folders can be ignored (see Pool frames of the Main window);
    • When moving files to a relative path, the path can now be resolved relative to a retained file (see Deletion page of the Options window);
    • Files with paths that are too long for CloneSpy to process can now be generally ignored (see Files page of the Options window).
  • Modified: The installer no longer requires administrator privileges for unpacking the portable version.
  • Fixed: Added an explanation for the formerly unknown error code 1392.
Latest comments
MarkyMark on 2015-04-09 15:36

A lot of people here trying to delete multiples of the same image - I just wanted to give a shout out to Dup Detector, which is a great piece of software that does exactly that.

Dup Detector doesn't just do file-size/checksum analysis, it actually analyzes the images to find similarities. E.g. one could be black & white and the other can be color, or one can be watermarked, or one could be taken 2 seconds later because someone blinked & it'll find both and display them to you and ask which one you want to delete or if you want to keep both. You can choose how strict it is in its matching algorithm - 100% mach, 95% match etc.

You can even have it set up to automatically select which one to delete based on rules - e.g. the smaller one. Then you just approve the selection by hitting the space bar, or you can just let it do its thing automatically, or you can go full-manual mode and click the image you want to delete. Super fast way to delete duplicates and easy to use. I've used it professionally to manage large image catalogs that had a lot of duplicates of different sizes.

Unfortunately, it's not portable.

The latest version I have is 3.3.02 from July 8, 2011. You can get an earlier version from rareware.

I am Baas on 2015-04-09 16:44

@MarkyMark Dup Detector is in the database at

MarkyMark on 2015-04-10 02:08

Oh awesome. Well, it's still great software - it does one thing & does it very well.

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AntiDupl.NET v2.3.9

webfork on 19 Aug 2018
  • 4MB (uncompressed)
  • Released on 9 Jan 2018
  • Suggested by JohnW

AntiDupl.NET is a tool to search for and delete identical or very similar pictures. Includes a customizable difference threshold and can highlight image differences, and supports supports JPEG, GIF, TIFF, BMP, PNG, EMF, WMF, EXIF, and ICON files.

The program can also detect image defects.

System Requirements: Win2K / WinXP / Vista / Win7 / Win8 / Win10
Writes settings to: Application folder
Dependencies: Microsoft.NET Framework 2.0
Unicode support: Yes
License: MIT License
How to extract: Download the self-extracting archive to a folder of your choice. Launch AntiDupl.NET.exe.
Similar/alternative apps: ImgSearch
What's new? See:
Latest comments
webfork on 2017-03-21 02:08

I thought my similar image analysis program of choice was more than adequate but this program is remarkably good. The program works really fast on a TON of images and the change detection is very useful.

__philippe on 2017-03-21 12:12


Appreciate your tightening of Antidupl.NET functional capabilities description, particularly in reference
to the product remarkable customizable divergence threshold and its image differences highlighting ability.

__philippe on 2018-01-23 07:38

Russian users are reporting some issues with AntiDupl v2.3.9
"version 2.3.9 # 7 is not working"

I'll gladly stick with v2.3.8 till the dust settles...;-)

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Bytessence DuplicateFinder v1.3.0

webfork on 15 Jun 2015
  • 1MB (uncompressed)
  • Released on 7 Oct 2011
  • Suggested by Wolfghost

Bytessence DuplicateFinder (BDF) detects all the cloned files that you might have on your computer. These files, in addition to taking up valuable space, can increase antivirus scan time, slow defragmentation and searches, and make it more difficult to organize your files.

The program employs optimized detection system and file filters to reduce scanning time. Detected files can be removed in no time with the help of the automatic file selector and the predefined set of actions (copying, moving or recycling).

Note: Website is offline, switched to

System Requirements: WinXP / Vista / Win7 / Win8
Writes settings to: Application folder
Stealth: ? Yes
Unicode support: Yes
License: Freeware
How to extract: Download the Portable ZIP package and extract to a folder of your choice. Launch BDF.exe.
Similar/alternative apps: DoubleKiller
Latest comments
bytessence on 2011-10-08 09:43

Hello! I am the developer behind BDF. I just released a new version of the program (1.3) which fixes some annoying bugs.

If you can reproduce the crash, please enable logging from the Settings dialog. The error handler should catch the exception and will write it in the log. You can send the log to the support e-mail and I'll try to fix the problem. Thanks and don't hesitate to contact me if you find bugs.

webfork on 2013-02-03 21:32

Might be my new favorite duplicate finding program on the site next to DoubleKiller (and certainly much easier to use).

webfork on 2013-05-10 01:51

Getting intermittent errors with the website. Softpedia link:

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Dup Detector v3.3.0.2

webfork on 17 Dec 2015
  • 2MB (uncompressed)
  • Released on 7 Aug 2011
  • Suggested by Kongu Tamil

Dup Detector finds duplicate or near-duplicate images by comparing image pixel data. As large image collections can over time pull in duplicates with different file sizes and different names, this program helps track those down and save disk space.

Note: main website down, linking to

System Requirements: WinXP / Vista / Win7 / Win8
Writes settings to: Windows registry. It was a tough call, but I finally decided to accepted it as portable because it is probably not something that you will run that regularly. And when you run the program on a different machine, a few parameters will need to be adjusted anyway.
Stealth: ? No. A yaP configuration file to make Dup Detector portable and stealth is available at
License: Freeware
How to extract:
  1. Download the installer and extract to a temporary folder
  2. Move the contents of {app} to a folder of your choice
  3. Launch DupDetector.exe
Similar/alternative apps: Awesome Duplicate Photo Finder, ImgSearch
What's new? V3.30 3/2/11
  1. Added support for .GIF

V3.301 4/17/11
  1. Added alternate file extensions (.jpg .jpeg .jpe .jif) and (.tif .tiff)

V3.302 7/8/11
  1. Made minor changes to use of image list
Latest comments
Andrew Lee on 2006-07-26 23:55

Since the license says it is freely distributable, I have added a direct download link for those of you who still want it.

AlephX on 2007-02-04 23:45

I had a DL error... anyway it´s possible to find it even at

peter48 on 2019-07-12 04:30

This software is old.
I did not manage to make it work under Windows 10.

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