About UltraDefrag
An open-source disk defragmenter, including boot-time defrag.
UltraDefrag is a popular pick in the utilities space, trusted by people who want results without the clutter. It ships with boot-time defrag and single-file defrag, and everything is a click away from the moment you open it.
Download the latest version of UltraDefrag for Windows below — free, safe and always up to date.
Key features
- ✓Boot-time defrag
- ✓Single-file defrag
- ✓Portable
- ✓Open source
Requirements
Windows 10 / 11, 64-bit
UltraDefrag — frequently asked questions
Is UltraDefrag free to download?+
Yes. UltraDefrag is free and open source, so you can use it at no cost.
Is UltraDefrag safe to download?+
Yes. HivApps links to the latest UltraDefrag build and keeps listings clean, with no bundled extras. As always, keep your antivirus on and only install software you trust.
What is the latest version of UltraDefrag?+
The latest version listed here is UltraDefrag 11, updated Aug 26, 2026.
What do I need to run UltraDefrag?+
Windows 10 / 11, 64-bit
How do I install UltraDefrag on Windows?+
Click the Download button on this page, run the installer once it finishes downloading, and follow the on-screen setup steps.
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Latest version (11) · Safe & clean