[Windows] Quickly locate and delete duplicate music files on your computer with Similarity

SimilarityIf you are into collecting music on your computer, you probably know that maintaining your collection can be difficult. Sometimes you already have a song on your computer, but when you rip a CD you end up with another copy. If you have not been keeping track of your music collection it may be getting out of hand. With all the moving, ripping, downloading and transferring you do, you are bound to end up with a few songs that are the same. The good news is that Similarity is here to keep your music collection well organized.


Main Functionality

As the name suggests, Similarity is a program that looks for music files on your computer that are duplicates. After it finds music that is the same, it lists it. From there you can delete the copy of the music that you do not want. In short, this program will help save room on your computer while keeping your music collection in tip-top shape.


  • Quickly scans your computer for duplicate music files
  • Extremely basic interface makes it very user-friendly
  • Can choose which drives you want to scan. Searching only the areas where music is saved on your computer will cut down on search time
  • Does not compare music by title or tag information. Instead, it checks for song bitrate, amplitude cut value, frequency, etc
  • Supports multiple music files: MP3, AAC, M4A, WMA, OGG, WAV, FLAC, APE, WV, and MPC


  • Free version is missing some of the features offered in the Pro version


Similarity screenshotUsing Similarity is extremely easy. After installing, you will see that the step up is very basic. On the left side of the program is an expandable list of folders. Here you can check which drives or folders you want to scan. The fewer folders you select, the quicker the search will be over. Thus, it is a good idea to only include folders where music is stored on your computer. When you are done choosing folders, just hit the “Play” button at the top of the program. This will start your search.

So why do I like Similarity better than other music comparing tools? This is mostly because it does more than just simply compare track titles and other tag information. So if you have the same song saved as two different names, this program can find it. It does this by analyzing files based on various parameters such as the song’s bitrate, amplitude cut value, frequency, etc. Not only that, but the program is able to read a variety of popular music formats.

The biggest problem I had with this program was the fact that it has a Pro version. This costs $19.95 for a one-year membership. Due to the fact that there is a Pro version, the free version is of course missing out on some features. For example, in the free version you have to manually delete duplicated songs, but in the Pro version the program can do that for you.


In the end, the free version of the program is perfect for people who do not have a ton of music saved on their computer but think they may have multiples of the same song. Although you have to delete these multiples manually, it is a small price to pay to get the program for free.

Price: Free

Version reviewed: 1.8

Supported OS: Windows XP / 2003 / Vista / 7

Download size: 1.72MB

VirusTotal malware scan results: 3/44 (Results include CNET Downloader)

Is it portable? No

Similarity download page

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  • siyuan123

    I am using DuplicateFilter.com to find and delete duplicate music files. It is very useful.

  • siyuan123

    I am using Duplicate Filter to find and delete duplicate music files. It is very useful. http://www.duplicatefilter.com

  • markbun

    I’ve experienced duplicate music files a year ago then searched on the net and found out about “DuplicateFilesDeleter” An easy fix for duplicates.

  • farkoleo

    Keeping unnecessary duplicates on your computer means wasting valuable hard disk space.
    Duplicate File Finder will find and delete duplicate files so you won’t experience
    lack of free disk space! By deleting duplicate files you can reduce time needed to
    defragment your hard drives and minimize time used by antivirus to scan your computer.

  • Frank D

    @Mr.Dave: My pleasure to help. It’s not often the finder and reviewer of a good program can do in-depth trial and error testing. Otherwise there’d be little time for anything else.

    P.S. I’ve gone through the marked duplicates and found that about 2/3 were really dupes and deleted them. The other 1/3 had significant variations and I decided to keep both. A very good program!

  • Frank D

    @Justin: And thank you for finding and reviewing the program for us!

  • Mr.Dave

    @Frank D: Thanks for all the in-depth comments, you convinced me this worth downloading. I wonder how well it works on live recordings that may have comments or applause cropped out at the beginning of one and not the other? Even if it only catches 90% of the duplicates, that adds up to a lot of space!

    And thanks to Justin as well for a writeup that got me interested in this program. I agree about the “pro” version but programmers have to eat also. I would have preferred a one-time purchase but since it’s an annual renewal I might buy it just to get everything organized in the first year. Then I would be very careful with each new song after that, to make sure it’s not a duplicate. Right….

  • @Frank D: Thanks for the updates! It is great that you were able to run an in-depth scan and really put this program to the test :)

  • Frank D

    It finished its work at 7 hours (for my 7,300+ mp3s). So, based on this, figure on 1,000 mp3s per hour, more or less.

    I have to retract my statement that the program wouldn’t play my mp3s in Windows Media Player (my default). Once the scanning finished, WMP started working as advertised.

    Now I can start comparing “duplicate” versions of the same songs for quality differences and fixing their tags pretty much at the same time.

    I’ll comment further if there are more discoveries.

    P.S. In case anyone is wondering, my vast mp3 library is filled with “oldies” — old, scratchy songs from the 1890’s through the 1920’s, which are in the public domain. I clean them up in Audacity to make them at least listenable, so they can be enjoyed by seniors and other interested parties.

    By the way, I tried another duplicate-finder program called DoubleKiller while waiting. It doesn’t do the in-depth similarity checks that Similarity does. DoubleKiller found seven duplicates while Similarity found 228.

  • Frank D

    Over 6 hours and it’s at 95%.

    One problem that will be a show stopper for me: The “play” option does NOT work.

    I checked on the developer’s forum and found two entries confirming this. The developer does not seem to be able to express what the user should do, other than to make the player (I mean MP3 here) the default player. I’ve done that but it still doesn’t work.

    If I can’t hear both of the tracks alternately to check their similarity/difference, I won’t know which one may be the better or worse of a pair. Therefore it’s a nice program to look at but its effectiveness for me is zero. Anyone else find this problem? Or an answer to it?

  • Frank D

    Almost 4 hours since I started, it’s 77% complete and still chugging along.

  • Ashraf

    @naveed: Updated the link, thanks.

  • Why don’t you provide a link to the original developer site instead of download.com’s probably spyware infested downloader?


  • Frank D

    @Justin: It’s now 42% complete. One additional feature I really like is its built-in MP3 tag editor, which I’m using to edit and fill in the missing items in the tags to the songs as the search is progressing. Pretty slick!

  • @Frank D: Wow, that’s a lot of songs! I did not have that many on my computer when I reviewed it, so I will be interested to see how the program does. I look forward to your update :)

  • Frank D

    I’m using it now to run through over 7,300 songs. After 20 minutes it’s about 20% complete. So far, it looks very good. I’ll know more when it finishes.