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Increase your system performance with this simple to use tool

4.7 Stars (113)
7,976 Downloads (This Week)
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Download ultradefrag-portable-6.1.2.bin.amd64.zip
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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

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

    Excellent and reliable tool for MANY years and across many versions of Windows. Some ease of use in configuration would be nice but it's not required. Otherwise, I've used and beta tested hundreds of software products and this is one of those few products that filter past all other worthy tools and become permanent keepers. It does what it's supposed to do, without making too much noise or wasting my time and it does it extremely well! I have to feel bad for some of the people who've sadly written negative remarks.. well due to your laziness in figuring out your own problems and blaming it on the tool, or just simply not reading the documentation, or not asking others for help, or just having unrealistic expectations, or some other senseless reason you're now having to live with the consequence of using a lesser quality competing product.

    Posted 07/10/2016
  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5


    Posted 06/23/2016
  • 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
  • 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
  • 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。 ◆ 完全最適化を実行した後、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。 最適化で期待する PC のパフォーマンス維持に威力を発揮できそうです。 ◆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。 ~機能が充実しています。性能に不満はなく、信頼できそうです。 知見上、“ベストワン” です~

    Posted 12/24/2015
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