UltraDefrag Icon


Increase your system performance with this simple to use tool

4.7 Stars (113)
9,029 Downloads (This Week)
Last Update:
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

    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
  • 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
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