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An Open Source Disk Defragmenter

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UltraDefrag at SourceForge

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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 7.1.0 release is coming soon [2018-03-28]

Dear friends! Thanks to your generous support we've finally managed to get out of troubles on the path to the next release. Also we've bought new testing equipment which helps us a lot to perform extensive testing and develop new features. The next 7.1.0 release will contain a lot of bug fixes and highly improved disk processing algorithms as well. Thank you again for your kind support! Stay tuned, more good news are yet to come!




  • Fast and efficient defragmentation algorithms.
  • 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, 10

Server: Windows NT 4.0, 2000, 2003, 2008, 2012, 2016

32-bit, 64-bit and Itanium editions