8 Best Defragmenters to Keep Your PC Running Like New

Abhishek Kurve 30-10-2008

A good defrag software that can clean your hard drives and optimize them for maximum performance is what every computer user needs. I’ve compiled a list of 8 great defragmenters, most of which I have used myself, and I’m pretty happy with the outcome.




Diskeeper is one of my favorite defragmentation softwares out there. In the past, I used to depend on the Windows built-in defrag utility to optimize and keep my hard disks in check but the perception changed after I tried Diskeeper.

After you have installed it, start the defragmentation once and it will fix any problems that your hard disk is currently suffering from. After that just leave it to Diskeeper. It will sit in the background and defrag your disks in real-time automatically when necessary. You’ll discover the change in your computer’s performance in no time.

You must be wondering that if it’s running in the background, your RAM/resources are being used making your PC slower. The answer to that is it doesn’t affect your system resources at all. It only uses the idle untapped resources to get the job done.

Download Diskeeper




PerfectDisk is an extremely thorough defragmentation application that completes defragmentation in a single run instead of multiple passes. It’s easy to use since it walks you through step by step instructions to give you the maximum outcome with detailed statistics on the fragmentation status of all of your files.

PerfectDisk uses the minimum of your system resources and has the ability to schedule automatic system defrags. Just put it on autopilot and it take care of the rest.

Download PerfectDisk


O&O Defrag [No Longer Available]


O&O Defrag is another great defragmenter which offers great flexibility. It automatically analyzes, defragments your internal and external hard disks. It comes with 5 defrag methods which particularly have different aims, each one achieving optimal results for the range of applications on each of your systems.

O&O’s defrag capacity is its other plus point which gives you the ability to defrag multiple volumes simultaneously. Its new background monitoring tool helps you defrag newly added and modified files automatically whenever your system is idle.

Download O&O Defrag




Defraggler is a freeware defragmenation software developed by Piriform Ltd, the same company that brought you the famous applications, CCleaner and Recuva. It allows you to defragment selectively individual files to get the job done in no time. All you need to do is run a analysis and it will list down all the fragmented files on the drive so you can select the files that you want to defrag.

It’s very easy to use. The latest version includes 64-bit support, has a nice interface and a faster defragmentation alogrithm.

Download Defraggler


IOBit Smart Defrag

IOBit Smart Defrag

IOBit SmartDefrag is a free software that offers the same features and quality as Diskeeper. The graph (as shown below) shows that it stands up head to head with the best defragmentation software out there. It gives you the options to do manual, automatic or scheduled defrags.

You’ll also notice “express” and “comprehensive” defrag options. If you choose “express” it will defrag your drives in much less time but if you choose comprehensive, it will do a great job.

smart defrag

It’s extremely easy to use and with its “install and forget” feature which works continuously, automatically and quietly in the background on your PC, it’s a must have

Download IOBit Smart Defrag

Auslogics Disk Defrag

Auslogics Disk Defrag

Auslogics Disk Defrag is a great freeware application that gets the job done in no time. After downloading and running it, it took less than 10 minutes to defrag one of my drives giving a full detailed report. It is, no doubt, designed for fast optimization. The interface is sweet and anyone whose using a defragmenter for the first time won’t have any problems at all.

It’s simple, reliable and quite fast. I would recommend Auslogics for anyone to try, since it’s free of charge anyway.

Download Auslogics Disk Defrag

JKDefrag [No Longer Available]


JKDefrag is a very simple, free to use, application that can completely take you by surprise. It’s a free GPL project; and it runs by default without you having to set up anything. Installation is very easy, just unzip the downloaded file to a specified folder and run it.

JKDefrag is completely automatic, very easy to use, does not impose any kind of load on the computer resources, with several optimization strategies, and can handle floppies, USB disks, memory sticks, and anything else that looks like a disk to Windows.



WinContig is another great tool that lets you quickly defrag files without the need to defrag the whole disk. It’s easy to use and doesn’t create any installation directories or Registry entries on your computer. It gives you two options; “Quick and Smart”.

If you choose the Quick method, WinContig does look for the first amount of free space large enough to defragment a file into and uses it. Use this defragmentation method if you use tools like Windows Defrag to defragment your hard disk on a regular basis.

If you choose the Smart method, WinContig does look for the amount of free space that best fits a file into and uses it. Also, if there is no free space large enough to fully defragment a file into, WinContig does try to reduce the number of fragments of that file.

It’s free of charge for anyone, does a fine job and can be a good fit.

Download WinContig

These were the 8 best defragmenters in my opinion that can get your hard disks clean and your computers optimized. If you think I missed something which should be mentioned and is better, please mention it in your comments.

You may also want to check out Mark’s defrag article from last October as well as MakeUseOf’s poll on best disk defrag programs.

Related topics: Computer Maintenance, Defragmentation, Hard Drive.

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  1. hamoo
    May 25, 2017 at 1:57 am

    i am impressed that defraggler installed on my xp x64 system flawlessly, and is running in 64 bit mode
    i am impressed that i was able to download and install defraggler, trial version, directly from piriform, without bloatware or pups
    i am impressed that windows defragmenter complained that it needed 10% disk space, even though it had 125 G free space, and 1G ram, and it stalled, but defraggler didn't skip a beat

    • hamoo
      May 26, 2017 at 9:05 pm

      uh, there's an update: defraggler did skip a beat. it choked on a 2G hdd with less than 10% free space. but i downloaded auslogic, and it picked up where defraggler left off. it is running in 32 bit mode, but hey, it runs like a champ. everything is running like a top. i guess i like both defraggler and auslogic, but auslogic is the one that didn't skip a beat; it rocks

  2. CincyJim
    October 25, 2009 at 9:54 pm

    No Vopt? Ever hear of it?

  3. Mike
    June 10, 2009 at 5:48 am

    Try "Power Defragmenter", lousy interface, but I find it most effective from more than a dozen defragmenters I've tried

  4. John
    April 30, 2009 at 12:38 am

    xulsolar - you are a MORON!!!!!!!!!!!!!!!!

  5. Sedigheh
    November 12, 2008 at 6:46 pm

    The Defragmenter is a GUI (Graphic User Interface) application for program Contig by Sysinternals.If you're an average XP user the standard Disk Defragmenter utility will do a good job of keeping your drives defragmented and help to maintain peak system performance.

  6. Chocolate Bill Jones
    November 1, 2008 at 12:07 pm

    Nice list Moin, you should add UltimateDefrag Freeware Edition 1.72 also.

  7. Babak
    October 31, 2008 at 10:22 pm

    check out the great defrag shootout, PerfectDisk FTW (DiskKeeper... not so much)

  8. Umar
    October 31, 2008 at 9:27 am

    Great list, Moin!

    I tried Auslogics, it worked great!!

    Going to download DisKeeper's Trial version .. 30 days is good enough for testing, I guess :)

  9. MoiN
    October 31, 2008 at 7:30 am

    @Chris: No, it shouldn't take 7 hours on a 80GB Hard disk. Try "Auslogics Disk Defrag" or "DisKeeper". I tried Auslogics last week on a 80 GB hard disk.. it took roughly 25 minutes on both drives -

    • Aibek
      November 1, 2008 at 9:04 pm

      Considerig that it's his first defrag ever that's very possibe. :-)

  10. Chris
    October 31, 2008 at 6:52 am

    Is defragging supposed to take 7hours for a half full 80gb drive? Mine did with SmartDefrag last week. (First defrag ever)

  11. Apollo
    October 31, 2008 at 4:19 am

    I've used a few of these programs, and I finally chose Diskeeper Pro (2008) for my system. It was the most user friendly and time-saving utility out of the lot. Just install it and enable automatic defrag mode, and it does the rest...couldn't be easier! Diskeeper defrags in the background using only idle resources so it never hurts my usage. Final results are great- all the drives always show minimal fragmentation and games load rapidly and play without stuttering, yet I never have to waste my time defragging :D

  12. breath
    October 31, 2008 at 4:02 am

    Actually you missed the one i think its the best, and free, defrag software, that is UltimateDefrag, the free version, its simple and has some good features.

  13. darkhorse
    October 31, 2008 at 2:53 am

    I second Diskeeper. I think its extermely useful for those who dont want to run defrag manually and its also far more efficient compared to the Windows defragger. The fact that it has a great GUI is only an additional advantage.

  14. MoiN
    October 31, 2008 at 12:07 am

    @ Metal : I would recommend DisKeeper.

  15. venkat
    October 31, 2008 at 12:00 am

    No operating system is safe from viruses and infections that's why use of these Anti-virus Products increasing ,I don't defragg my hard drive .

  16. Metal Horn
    October 30, 2008 at 11:52 pm

    MoiN, which one is the best defragmenters in this list?

    • Jansen
      October 31, 2008 at 7:07 am

      PerfectDisk is the one...

  17. The Windows Fix
    October 30, 2008 at 11:19 pm

    What did you use to check how well they did after wards? I mean performance wise?

  18. Mobile Answers
    October 30, 2008 at 11:06 pm

    Those programs honestly are just more expensive versions of the regular defraggers. Speaking in terms of Windows, the Windows defrag tool works just fine if not best and it's free with your windows. Most of those are just more glamorized (better ui) versions of windows defrag're paying for the bonus of it adding a scheduled task to run the program at random intervals. That's it - o&o for example, does the same damn job as windows defrag - in fact it uses windows defrag commandline utility to run the defrag.

    So I recommend Windows Defrag - price: FREE

    • Womble
      October 31, 2008 at 4:44 am

      I have to agree on the whole, Windows defrag uses the diskeeper engine anyway. I must confess to liking the ability to right click a folder and have it defragged in JKDefrag though.

      I guess it's just about the features really.

      • Aibek
        November 1, 2008 at 9:02 pm

        Well, it's also about speed...JKDefrag works 5x faster (if not more) then Windows defrag

  19. xulsolar
    October 30, 2008 at 8:42 pm

    Use Linux (ubuntu) and you won't need a defragmenter software. By the way, you won't need an antivirus either...