| UltraDefrag | |
|---|---|
 | |
| Original author(s) | Dmitri Arkhangelski, Stefan Pendl, Justin Dearing, Sayem Chaklader |
| Developer(s) | Green Gate Systems, LLC |
| Initial release | July 5, 2007 |
| Stable release | 14.0.0 (April 19, 2025) [±] |
| Repository | sourceforge |
| Written in | C, C++, Lua, JavaScript |
| 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 |
| Type | Defragmentation software |
| License | Proprietary for 8.0.0+, GNU GPL for 7.1.x and under |
| Website | ultradefrag |
UltraDefrag is a disk defragmentation utility for Microsoft Windows. Prior to version 8.0.0 it was released under the GNU General Public License.
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In 2018, UltraDefrag sources have been relicensed to Green Gate Systems. Their enhanced version, released under a 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. [1]
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. [2]
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. [3]
