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Increase your system performance with this simple to use tool

4.7 Stars (111)
10,630 Downloads (This Week)
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UltraDefrag is a disk defragmenter for Windows, which supports defragmentation of locked system files by running during the boot process. It is easy to use without any complicated scripting or a huge load of configuration settings. You can filter the files processed by size, number of fragments, file name and path. You can terminate the process early by specifying an execution time limit.

UltraDefrag Web Site


  • Boot Time Defragmentation for system file processing
  • Console interface for batch processing or setting up scheduled tasks
  • Graphical user interface to follow the process visually
  • Process single files, folders or drives from the Explorer context menu
  • Specialized processing algorithms for each situation
  • Available for both 32bit and 64bit Windows
  • Optional dryrun to get a preview of the resulting disk usage


User Ratings

ease 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
features 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
design 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
support 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
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User Reviews

  • gets
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    open discussion yes i want to discute abou this, and i hope here is the raight place to do it since i couldn find any email. First lets begin about how much im waiting to perform a full optimization, like 30 hours fot 65% i would never do full op again, that i regret, i would never do again becouse im lie almos 2 days wainting fot 1 Tb 2 tb free. But.ok , i was waiting until i hit the X and it exit the prog,wheres th3 confirmation window? comen on developers, now i have to do everything again im fuked up and its your fault. now everything is going again at the end of hd innstead of continuing putting blocks from end of hd wich i continue yoo know what im mean. very angry, will never use this.again.

    Posted 03/26/2016
  • barton_c
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    Nice piece of software with well thought-out documentation. Beautiful website, too.

    Posted 02/16/2016
  • cburgess7
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    I've been using this since v5.0.x (i can't remember exactly which subversion) but it has just been getting better. I tested it on my old laptop that took nearly 5 minutes to boot and login and start using. After defraging, it took less than a minute, it did take a super long time to defragment and optimize, but it has to move a lot of files. I recently got v7 on win7, which my windows 7 got so sluggish, it took nearly 5 minutes (like my 2002 laptop) to get booted up to start using. After an overnight optimization, I restarted my computer to test it out and boot up was nearly instantanious. I logged in, and everything popped up like, if you blinked, you missed it. The user manual is pretty straight forward, and anyone with a very basic understanding about how code works can modify how ultradefrag behaves, how the UI looks, etc. It also explains how everything is supposed to work, and how to use the boot scan, and give very deep explanation after the straight forward explanations answering all the questions I had on how to use the golden piece of software. No one should be without this software. Stellar job ultradefrag developer person.

    Posted 01/24/2016
  • janvandevee
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    design looks like the program was written in 1974 or so. poor GUI, lots of command-line tools... this is 2015. when only 1 file needs defragmenting starting from the contect menu, the c: disk is analyzed. why ? even a 3 kb plain text file starts a >30 seconds defragmentation process !? uninstalled.

    Posted 12/24/2015
  • nomu-kyon
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    過去に、「すっきり!! デフラグ」、「Defraggler」、「Smart Defrag」を使用したことがあります。 現在は、有料の「Norton Utilities 16」を常用しています。 “SourceForge.net Update” で「UltraDefrag」を知り、User Reviews などを参考に試用を決断しました。 ◆ Microsoft Defrag で 8 時間以上、 Nortonで 6 時間ほど要していた Defragmentation (完全最適化)が、4 時間ほどの驚異的な短時間で完了してしまいました。 念の為に、Norton で再実行したところ “断片化 0 、Defrag 無用” と表示がでました。 PC の異常も認められませんでした。 驚異的な高速性能ながら、最適化も信頼できそうです。 ◆便利で、実用的な Option も備わり、充実しています。 ◆ PC を隈無く Scanning してしまう tools ながら、Open - Source で商品化している点も安心材料です。 ~抜群の高性能ぶりに驚かされました。 知見上、“至高の決定版” です~

    Posted 12/24/2015
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