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{{Infobox software
| name = UltraDefrag
| logo = Ultra defrag.gif
| screenshot =
| caption = UltraDefrag 12 on [[Windows 10]]
| author = Dmitri Arkhangelski, Stefan Pendl, Justin Dearing, Sayem Chaklader
| developer = Green Gate Systems, LLC
| released = {{Start date and age|2007|07|05}}
| repo = {{URL|https://sourceforge.net/projects/ultradefrag/}} (Only open source release of UltraDefrag)
| operating system = [[Windows 11]] [[Windows 10]] [[Windows 8.1]] [[Windows 8]] [[Windows 7]] [[Windows Vista]] [[Windows XP]] [[Windows 2000]] [[Windows NT 4.0]]
| platform = [[IA-32]], [[x64]], [[IA-64]]
| programming language = [[C (programming language)|C]], [[C++]], [[Lua (programming language)|Lua]], [[JavaScript]]
| genre = [[Defragmentation software]]
| license = [[Proprietary software|Proprietary]] for 8.0.0+, [[GNU General Public License|GNU GPL]] for 7.1.x and under
| website = {{URL|https://ultradefrag.net/}}
}}

'''UltraDefrag''' is a [[Defragmentation|disk defragmentation utility]] for [[Microsoft Windows]]. Prior to version 8.0.0 it was released under the [[GNU]] [[GNU General Public License|General Public License]]. The only other Windows-based defragmentation utility licensed under the GNU GPL was [[JkDefrag]], discontinued in 2008.<ref>{{cite web | url = http://www.kessels.nl/JkDefrag/index.html | title = JkDefrag v3.36 | first = Jeroen | last = Kessels | archiveurl = https://web.archive.org/web/20150215060146/http://kessels.nl/JkDefrag/index.html | archivedate = 2015-02-15 }}</ref>

In 2018, UltraDefrag sources have been relicensed to [[Green Gate Systems]]. Their enhanced version, released under a [[Proprietary software|proprietary]] license, features automatic defragmentation, disk cleanup before defragmentation, graphical interface for setting user preferences, optimization of solid state drives, full compatibility with [[Windows 11]] and 10, and is said to have much faster disk processing algorithms.<ref>{{cite web | url = https://sourceforge.net/p/ultradefrag/news/2018/09/ultradefrag-710-and-800-have-been-released/ | title = UltraDefrag 7.1.0 and 8.0.0 have been released}}</ref>

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.<ref>{{cite web | url = https://ultradefrag.sourceforge.net/handbook/Introduction.html | title = UltraDefrag Handbook: Introduction}}</ref>

[[Jean-Pierre André]], one of the developers of [[NTFS-3G]], has created a fork of UltraDefrag 5 that runs on Linux. It only has a command-line interface.<ref>{{cite web |title=Advanced NTFS-3G Features |url=https://jp-andre.pagesperso-orange.fr/advanced-ntfs-3g.html#ultradefrag |website=jp-andre.pagesperso-orange.fr |accessdate=10 October 2019}}</ref>

==Features==
* Automatic defragmentation
* Automatic disk cleanup before defragmentation
* Defragmentation of individual files and folders
* Defragmentation of locked system files
* Defragmentation of NTFS metafiles (including [[Master File Table|MFT]]) and [[NTFS#Attribute lists, attributes, and streams|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 [[File Explorer|Windows Explorer]]'s context menu
* Command line interface
* [[Portable application|Portable]] edition
* Full support of 64-bit editions of Windows

==See also==
* [[Comparison of defragmentation software]]
* [[File system fragmentation]]

==References==
{{Reflist}}

==External links==
* {{Official website}}

[[Category:Free defragmentation software]]
[[Category:Free software programmed in C]]
[[Category:Free software programmed in Lua (programming language)]]
[[Category:Windows-only free software]]
[[Category:Lua (programming language)-scripted software]]

{{Storage-software-stub}}

UltraDefrag - Revision history

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