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Ultra defrag.gif
UltraDefrag 7.0.0 beta1 on Windows 8.png
UltraDefrag on Windows 8
Original author(s) Dmitri Arkhangelski, Stefan Pendl, Justin Dearing, Sayem Chaklader
Stable release 7.0.1 (March 26, 2016 (2016-03-26)) [±]
Preview release
7.0.0 RC1 / December 20, 2015; 9 months ago (2015-12-20)
Written in C, Lua, JavaScript
Operating system Windows NT 4.0
Windows 2000
Windows 2003
Windows XP
Windows Vista
Windows XP x64 Edition
Windows 7
Windows 8
Type Defragmentation program
License GNU General Public License
Website ultradefrag.sourceforge.net

UltraDefrag is an open-source disk defragmenting utility for Microsoft Windows. It is released under the GNU General Public License. The only other Windows-based defragmentation utility with a GNU GPL was JkDefrag, but its GPL version was discontinued in 2008.[1]

UltraDefrag uses Microsoft's defragmentation API and works on Windows NT, 2000, XP, Server 2003, Vista, 7 and 8 operating systems. It supports FAT12, FAT16, FAT32, exFAT, and NTFS file systems.[2]

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