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An Open Source Disk Defragmenter

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The term UltraDefrag is a shorthand for the Ultra Defragmenter and holds no connection with potential owners of registered trademarks or other rights. All trademarks, brands, and names are the property of their respective owners.

UltraDefrag is an open source disk defragmenter for Windows. It can quickly defragment everything including files which are usually locked by Windows. For instance, UltraDefrag can re-join paging and hibernation files.


UltraDefrag 7.0.1 has been released [2016-03-26]

This release features improved crash handling as well as upgrade to wxWidgets 3.1.0 library, which fixes a lot of bugs. Additionally, thanks to Sherzod Mamatkulov, Uzbek (Latin) translation is now available for UltraDefrag.

We have a lot of exciting ideas for the next release, but no time for development. You are welcome to help us, however, via donations. As soon as we'll collect $15000 we'll be able to retire from other activities for a while and return back to active UltraDefrag development.

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$4375 collected towards $15000 [?]



  • Simple but efficient defragmentation algorightms.
  • Defragmentation of NTFS metafiles and streams.
  • Optimization of NTFS master file tables (MFT).
  • Automatic hibernation or shutdown after the job completion.
  • More...



Desktop: Windows NT 4.0, 2000, XP, Vista, 7, 8

Server: Windows NT 4.0, 2000, 2003, 2008, 2008 R2, 2012

32-bit, 64-bit and Itanium Editions