Defraggler is a formerly-supported freeware defragmentation utility developed by Piriform Software, which can defragment individual files or groups of files on computer memory systems. Defraggler runs on Microsoft Windows; it has support for all versions since Windows XP. It includes support for both IA-32 and x64 versions of these operating systems. In September 2026, Piriform announced that Defraggler had reached its end of life. It is no longer hosted on Piriform's website, and all download and support pages for the product have been removed.
Overview Defraggler can defragment individual files, groups of files (in a folder) or an entire disk partition, either by the user's command or automatically on a schedule. It supports FAT32, NTFS, and exFAT. It can also be installed as a portable application on a USB flash drive. Defragmentation of RAID disks is also supported, although no details are supplied.
Defraggler was given a 5/5 star rating from Softpedia. In Lifehacker's Hive Five for Best Disk Defragmenter, Defraggler received first place.
See also CCleaner Recuva Comparison of defragmentation software
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