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Ultra defrag.gif
UltraDefrag on Windows 8
UltraDefrag on Windows 8
Original author(s)Dmitri Arkhangelski, Stefan Pendl, Justin Dearing, Sayem Chaklader
Developer(s)Green Gate Systems, LLC
Initial releaseJuly 5, 2007; 11 years ago (2007-07-05)
Stable release
8.0.0 / September 28, 2018; 2 months ago (2018-09-28)
Preview release
7.1.0 / September 28, 2018; 2 months ago (2018-09-28)
Written inC, C++, Lua, JavaScript
Operating systemWindows NT 4.0
Windows 2000
Windows XP
Windows Vista
Windows 7
Windows 8
Windows 8.1
Windows 10
LicenseProprietary for 8.0.0,
GNU GPL for 7.1.0

UltraDefrag is a disk defragmentation utility for Microsoft Windows. Prior to version 8.0.0 it was released under the GNU General Public License. The only other Windows-based defragmentation utility licensed under the GNU GPL was JkDefrag, discontinued in 2008.[1]

In 2018, UltraDefrag sources have been relicensed to Green Gate Systems, LLC. Their enhanced 8.0.0 version, released under a proprietary license, features automatic defragmentation and is said to have much faster disk processing algorithms.[2]

UltraDefrag uses the defragmentation part of Windows API and works on Windows NT 4.0 and later. It supports FAT12, FAT16, FAT32, exFAT, and NTFS file systems.[3]


  • automatic defragmentation
  • defragmentation of individual files/folders
  • defragmentation of locked system files
  • defragmentation of NTFS metafiles (including MFT) and streams
  • exclusion of files by path, size and number of fragments
  • optimization of disks
  • disk processing time limit
  • defragmentation of disks having a certain fragmentation level
  • automatic hibernation or shutdown after the job completion
  • multilingual graphical interface (over 60 languages available)
  • one click defragmentation via Windows Explorer's context menu
  • command line interface
  • portable edition
  • full support of 64-bit editions of Windows

See also[edit]


  1. ^ Kessels, Jeroen. "JkDefrag v3.36". Archived from the original on 2015-02-15.
  2. ^ "UltraDefrag 7.1.0 and 8.0.0 have been released".
  3. ^ "UltraDefrag Handbook: Introduction".

External links[edit]