Windows · Free download · System

UltraDefrag

UltraDefrag is a powerful disk defragmentation tool for Windows.

Operating system
Windows 10/11
File size
2.11 MB
License
OpenSource under LGPL
Last updated
Apr 30, 2026
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Overview

What is UltraDefrag?

UltraDefrag is a powerful disk defragmentation tool for Windows.

In depth

A closer look at UltraDefrag

UltraDefrag is a powerful disk defragmentation tool for Windows. It is the first open source defragmenter with full support of system locked files defragmentation. Actually all files including registry hives and paging file can be processed by UltraDefrag during the Windows boot process.
  • Boot Time Defragmentation:This feature provides an ability to defragment any system files. Including page file, registry hives, hiberfil.sys file and many other files locked by the system or other applications when windows is fully running.
  • Fast Disk Optimization:The optimizer rearranges all data and places them to the beginning of the drive. In many instances we have found, that the system is more stable and performs a lot better under load, if data is placed at the beginning of the drive.
  • Single File and Folder Defragmentation:After UltraDefrag is installed you have the ability to select any file or folder and deframent it. This option is mostly useful, if you have recently installed an application or a game and would like to have it defragmented immediately for maximum performance.

Requirements

System requirements

Windows 2000 / XP / Vista / Windows 7 / Windows 8 / Windows 10 / Windows 10 64-bit

Verdict

Should you download UltraDefrag?

UltraDefrag runs on Windows 10/11 and is available under the OpenSource under LGPL license — the installer is 2.11 MB. We’ve catalogued it under System.

Verified clean. Every UltraDefrag build on SoftLookup is scanned for viruses, spyware, adware, trojans and backdoors. We re-test on every update.
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At a glance

UltraDefrag specifications

Category
System
Publisher
UltraDefrag Development Team
Last updated
Apr 30, 2026
Requirements
Windows 2000 / XP / Vista / Windows 7 / Windows 8 / Windows 10 / Windows 10 64-bit
License
OpenSource under LGPL
Operating system
Windows 10/11
File size
2.11 MB
Price
Free
Page views
747

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