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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 not enough time for development. You are welcome to support the project, however, via donations. So far we have to raise $15000 to retire from other activities and return back to active UltraDefrag development.

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$4125 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