Cut Computer Waste in Half

Photo: Sam UL

I’ve owned my desktop PC for a little over 3 years, and most days I’m scared to look into my folders to see what I’ve been hoarding. Wading through thousands of pictures, Word documents and PDF’s to “trim the fat” is not something I look forward to. A recently discovered free program, however, has taken that task and made it completely possible.

PC Magazine was the first to introduce me to the wonders of the Double Killer app. Free for download at several locations, I went directly to the official site to get my limited copy. This .zip file took little time to download, and I was running in no time. What’s it do? Everything I imagined, and more!

By selecting the folder I want to target, Double Killer scans for files that are similar in name, size, date, and CRC32 Checksum (think unique fingerprint.) Each of these scan criteria are optional, and I had best results with size and CRC32 checksum (which appear to be the default.)

Once the scan is complete, a list of all files with duplicates are listed (each grouped with it’s “twin”), and you have the option to go through them one by one, or just select all of the duplicates and trash them. It is recommended that you either select “Check first dupes” or “Check last dupes” but NEVER both! This could get rid of all copies of the file – not what we are intending. The same undesirable outcome will happen if you select “Check all.” Once you have selected the stuff you want gone, you can choose to send them to a new folder for careful review later (recommended) or delete them permanently. The premium version is $19.99 and allows you to send to a recycle bin, instead.

My first scan rid my Documents folders of over 1106 duplicate files and a 103,801 kb of unnecessary junk. My Pictures folder had even more garbage – hundreds of duplicate pictures that I downloaded without deleting from my digital camera more than one or two times. And since my FireFox browser is set to put a copy of all downloads directly on my Desktop, I had more duplicate installation files and application shortcuts than one girl should ever have! This cleaned it up in less than a minute!

Double Killer can mess things up if you’re not sure what you’re doing, but the included help index covers it fairly well. If you’re wanting to use the application for commercial purposes, you’ll need to spring for the full version. For one private workstation, however, this is one free app I’ll use often.

(I have also heard rumblings of some fantastic Open Source versions of a duplicate file scanner, but I haven’t tried them personally. For a good listing of OS options, visit SourceForge and search for "duplicate files".)

No votes yet
Your rating: None

Disclaimer: The links and mentions on this site may be affiliate links. But they do not affect the actual opinions and recommendations of the authors.

Wise Bread is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to

Guest's picture

It seems like a good program, only problem is when I extract it I get a CRC error, I did manage to overcome this when I got it's not a Win32 program error.

BTW what are the OpenSource eqivulants ?

Guest's picture

I have contacted the author of the program, so I hope to get this solved.

It would be nice if wisebread posted on their blog the opensource alternatives in the coming days !!!! :)

Linsey Knerl's picture

I found that Duplicate Files Searcher (the OS product I had heard about previously) is highly recommended by many (although I haven't tried it myself.) Over at LifeHacker, there was a discussion about this tool. There is an Open Source version that may work well for you.

I can't vouch for the credibility of any other programs. But since Double Killer didnt' work for you, it might serve you to look for something comparable.


Linsey Knerl's picture


Sorry to hear about the bugs with Double Killer.  I had no problems, but systems will vary.  I updated the post to include SourceForge as a resource for finding an alternative OS option.


Linsey Knerl

Guest's picture

I use easy duplicate finder. It was reccommended by my PC "guru". down load and you're off sounds much akin to double killer. I use the default settings and let it tear through the whole pc all at once (that can take awhile) then you get the same sort of options keep this or that or neither. never had any problems with it and I run it once or twice a month.

Linsey Knerl's picture

Easy Duplicate Finder seems to have gotten some good reviews as well.  I appreciate you letting us know that it worked!

Guest's picture

I have a great list on my website on how you can improve the safety and speed of your computer, check it out.
Twelve ways to keep your computer running safer and faster

Guest's picture

I am truly pleased to read this webpage posts which includes lots of useful data, thanks for providing
such statistics.