Free Defragmentation / Defrag Utilities

Free Defraggers / Defragmentors that defragment your hard disk

Free Defragmentation Utilities / Free Defragmentors / Free Defrag

The free defragmentation utilities listed on this page purport to defragment your hard disk, that is, they move the various fragments of your file so that they are in one contiguous chunk. A defragmented hard disk has at least a couple of advantages over a badly fragmented one - your system may operate faster, since the operating system does not have to move the drive head of the drive all over the hard disk to load the different portions of a file, and it is generally slightly easier to recover an accidentally deleted file, since the various segments of the file are placed in contiguous clusters.

Note that this page does not cover commercial disk defragmentation tools like Raxco PerfectDisk.

Be aware also that if you use Windows, you already have a defragmentation tool installed; Windows comes with a somewhat slow but otherwise functional defragmentation utility.

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Free Defraggers / Defragmenters / Defragmentation Tools


Defraggler lets you defragment your entire hard drive, individual folders or individual files at your option. It is also able to defragment your free space, so that all the unused hard disk space is gathered in one big chunk. The defrag utility also supports RAID drives. The program works on Windows 2000, 2003, XP, Vista and 2008. Both NTFS and FAT file systems are supported.


WinContig allows you to defragment your hard disk, folders and/or individual files. It works on Windows 2000, XP and Vista. You can also use Windows Task Scheduler to create defragmentation schedules. It can either (at your option) defragment a file into the first free area it finds, or look for an area that best fits the file you are defragmenting. If there is no space big enough to fit the defragmented file, it will try to defrag as much of the file as possible.

Ultra Defragmenter

Ultra Defragmenter is a defrag tool for Windows 2000, XP, Server 2003 and Vista. You can control it either via the graphical user interface (GUI) or the command line. It is released with source code and is distributed under the terms of the GNU General Public License.


Contig is a command line defragger for Windows NT, 2000 and XP. You invoke it from a Windows command prompt with the name of the file you want defragmented. It's useful if you don't want to run the built-in Windows defragmentation tool just to defragment a single file.


SpeeDefrag is a program that restarts your computer and runs only the Windows defrag program. With only the Windows defragmenter running, defragmentation will presumably run faster (provided you don't count the time it takes to reboot the system). You can also schedule the defrag run, as well as shutdown the computer after defragmentation. The program runs under Windows XP and Vista.

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