13 Best Free Defrag Software Tools

Reviews of the best free disk defragmenter programs for Windows

Defrag software programs are tools that arrange the bits of data that make up the files on your computer so they're stored closer together. This allows your hard drive to access files more quickly.

Defragmentation, in other words, can help improve your computer's performance by making the reading of files more efficient, thanks to the fact that all the tiny pieces that make up a single file are right next to each other.

Still confused? See What Is Fragmentation & Defragmentation? for more help understanding what fragmentation is and why defrag software is helpful.

All versions of Windows include a built-in defrag program, which we've ranked in this list. However, in most cases, a dedicated program, like any of the other free defrag software programs listed here, will do a better job.

We've only included freeware defrag software in this list. In other words, only completely free defragmentation programs—no shareware, trialware, etc. If one of these free defrag programs has started charging, please let us know.

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Defraggler v2.20.989
What We Like
  • Defrags can be run automatically on a schedule

  • Can run a defrag during reboot

  • You can defrag specific files and folders

  • Data can be excluded from the defrag

  • Can be run directly from Explorer

  • Lets you move lesser-used fragmented files to the very end of the drive

  • A portable version is available

What We Don't Like
  • Might be confusing if you don't want to deal with all the extra options

  • Doesn't support idle defragging

  • Installs another program unless you uncheck that option during setup

  • No update since 2018

Piriform's Defraggler tool is easily the best free defrag software program out there. It can defrag the data or just the free space of an internal or external drive. You also have the option of defragmenting specific files or folders and nothing more.

Defraggler can run a boot time defrag, check a drive for errors, empty the Recycle Bin before defragging, exclude certain files from a defrag, run an idle defrag, and selectively move lesser-used files to the end of the drive to speed up disk access.

Defraggler is also available in a portable version for flash drives.

If the Piriform company sounds familiar, you may already be familiar with their very popular free CCleaner (system cleaning) or Recuva (data recovery) software.

Defraggler can be installed on Windows 11, 10, 8, 7, Vista, and XP.

During setup, uncheck Try Google Chrome before installing Defraggler if you don't want to install the Chrome browser along with this program.

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Smart Defrag

Smart Defrag disk defrag tab
What We Like
  • Will run a defrag automatically on a schedule

  • A defrag can run while the computer is booting up

  • Files you access often can be moved to faster parts of the drive

  • A portable version is available

  • Can clean up the drive before the defrag to speed it up

  • Lots of options for post-defrag, like to reboot

  • Exclusions can be applied to the defrag

What We Don't Like
  • Some of the features are only usable if you pay

  • Can't defrag automatically when the computer is idle

  • Setup might attempt to install another program

Smart Defrag is great when it comes to scheduling an automatic defrag since there are some very specific advanced settings.

It supports running a defrag on a schedule as well as using boot time defrags to remove fragments from locked files.

Smart Defrag can also exclude files and folders from a defrag/analysis, replace Windows Disk Defragmenter, defrag just Windows Metro Apps, and skip defragging files that are over a certain file size.

Also included is a feature which removes junk files in Windows and Internet Explorer. It also clears cache files in other parts of Windows that could help speed up a defrag.

Windows 11, 10, 8, 7, Vista, and XP users are able to install and use Smart Defrag.

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Auslogics Disk Defrag

Auslogics Disk Defrag v10 in Windows 10
What We Like
  • Free for personal and commercial use

  • Updates often

  • Files and folders can be excluded from a defrag

  • Important system files can be moved to the faster part of the drive

  • Lets you disable the ads

What We Don't Like
  • Boot-time defrags aren't available for free

  • Unable to move custom files to the end of the hard drive

  • Tries to install several unrelated programs during setup

  • Scheduling isn't free

With Auslogics Disk Defrag, system files, which are normally commonly used files, can be configured to be moved to faster areas of a disk to improve launch times and general system performance.

You can also check a drive for errors with chkdsk and exclude files/folders from a defrag.

It works with Windows 11, 10, 8, 7, Vista, and XP.

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Puran Defrag

Puran Defrag - Free Defrag Software
Puran Defrag. © Puran Software
What We Like
  • Can defrag when the computer is idle

  • Able to move commonly used files to the faster part of the hard drive

  • Supports scheduled defrags

  • Includes an option to run a defrag during boot up

  • Defragmenting can start from the file/folder level

  • Can also check the HDD for errors

What We Don't Like
  • Doesn't show all the fragmented files (only the top 10)

  • There isn't a portable option

  • Setup might attempt to install another program

  • The results after analyzing the drive are hard to read

  • Free space defrags can't be run manually (only scheduled)

  • An updated hasn't been released since 2016

Puran Defrag features a custom optimizer called Puran Intelligent Optimizer (PIOZR) to intelligently move common files to the outer edge of a disk to speed up access to those files.

Like some of the other programs from this list, this one can defrag files and folders from the Windows Explorer right-click context menu, delete custom files/folders before a defrag is launched, and run boot time defrags.

There are very specific scheduling options available in Puran Defrag like running an automatic defrag every so many hours, when the system goes idle, or when the screensaver starts.

Particular schedules can also be set up for boot time defrags like running it on the first computer boot up of the day, on the first of the week, or the first time your computer boots up every month.

One thing we don't like about this tool is that it tries to install additional programs during setup.

It's said to be compatible with Windows 10, 8, 7, Vista, XP, and Windows Server 2008 and 2003.

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Disk SpeedUp

Screenshot of Disk SpeedUp in Windows 10
What We Like
  • Lots of defrag settings that you can tweak

  • Can defrag when the computer idles

  • Exclusions can be set up so as to not be defragged

  • Defrags can be run while the computer is starting up

  • Files you don't use often can be moved to the slower parts of the disk

  • Lets you set up a defragmenting schedule

What We Don't Like
  • Doesn't integrate itself into Explorer to make it easier to defrag files/folders

  • Might try to install another program during setup

Disk SpeedUp is another free defrag program that can defrag not only whole hard drives but also individual files and folders. You can also run an automatic defrag when the system has been idle for a particular number of minutes.

This program has very specific settings. For example, you can disable defrags if files have fragments that are smaller than 10 MB, have more than three fragments, and are larger than 150 MB. All of these values can be customized.

You can also configure this defrag tool to automatically move large, unused, and/or files of a certain format to the end of the drive so the commonly used, smaller ones end up toward the beginning, hopefully improving access times.

In addition to the above, Disk SpeedUp can exclude files and folders from a whole system defrag, run a boot time defrag, turn off the computer when a defrag has completed, and run defrags/optimizations on one or more drives on a daily/weekly/monthly schedule.

This program was designed for Windows 8, 7, Vista, XP, and Windows Server 2003. It should also work just fine in newer versions of Windows, like Windows 11 and 10.

Disk SpeedUp might try to install other Glarysoft programs during setup, but you can easily uncheck anything you don't want.

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Toolwiz Smart Defrag

Screenshot of Toolwiz SmartDefrag
Toolwiz SmartDefrag. © ToolWiz Software
What We Like
  • Very simple and easy-to-use interface

  • Shows how many files are fragmented

  • Moves archives to the slower parts of the drive to speed up access to other files

What We Don't Like
  • Very outdated; hasn't been updated since 2015

  • Doesn't support scheduled defrags

  • Doesn't show the level of fragmentation on the whole drive

  • Can't customize anything

  • Might not work for you in Windows 11/10

Toolwiz Smart Defrag is a small program that installs quickly and has a spotless, minimal interface. It claims to be 10 times quicker than the default defrag tool included in Windows, and can place archive files to a different part of the drive to speed up access to regular files.

You're able to see the number of fragmented files from an analysis and run a defrag really quickly, though you can't see the level of fragmentation that exists on a drive, nor can you schedule defragments to run at a later date.

Though it's nice to have a program that isn't packed full of buttons and other toolbars, it's also sometimes unfortunate. For instance, there are zero features that you can customize.

If you're looking for a program that's super simple to use and isn't bogged down with confusing settings or buttons, this program is absolutely perfect.

This program officially works in Windows 7, Vista, and XP. We were able to use it just fine in Windows 8 as well.

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O&O Defrag Free Edition

O&O Defrag Free Edition - Free Defrag Software
O&O Defrag Free Edition. © O&O Software
What We Like
  • Defrags can run each time the screensaver comes on

  • Supports scheduled defragging

  • Scheduled defrags can be set to not run if fragmentation is too low

  • The really large system restore point files are moved to slower parts of the disk to increase performance for other files

  • Produces extremely detailed hard drive reports

What We Don't Like
  • Doesn't work with Windows 11, 10, or 8

  • Some features are not free to use, so you'll be prompted to buy the full version

  • Doesn't let you exclude files from defragmentation

  • Can't defragment removable hard drives

  • Unable to defrag during boot up

O&O Defrag Free Edition has an organized and easy to use interface. It supports common features found in similar defrag software, like optimizing a drive, viewing a list of all the fragmented files, and checking a drive for errors.

In addition to scheduling defrags on a weekly basis, you can also configure O&O Defrag Free Edition to start a defrag automatically when the screensaver comes on.

You can optionally run through a Quick configuration wizard to easily set up scheduling or immediately optimize a drive.

Some features are only available in the paid version of O&O Defrag, which means you'll sometimes try to enable a setting only to be told you can't because you're using the free version, which can get irritating.

O&O Defrag Free Edition is compatible with Windows 7, Vista, and XP. We tested the most recent version in Windows 10 and Windows 8 but wasn't able to get it up and running.

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UltraDefrag v7.0.0
What We Like
  • Includes advanced options but they're hidden away for beginners

  • Can check a hard drive for errors

  • It defrags both internal and external hard drives

  • Lets you defragment individual files and folders, not just entire HDDs

What We Don't Like
  • Advanced changes require you to edit a configuration file

  • Scheduled defrags are hard to turn on

  • Last updated in early 2020

UltraDefrag can be used for novice and advanced users alike — there are common features that everyone can use but also advanced options if you need to make specific changes to the program.

Common functions like repairing, defragging, and optimizing drives are as simple as any of these other programs. However, if you wish to make changes to the program in general or to the boot time defrag option, you have to know how to maneuver around a BAT file.

UltraDefrag is said to run in Windows 8, 7, Vista, and XP only, but we were also able to use it in Windows 11 and Windows 10.

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Screenshot of MyDefrag
MyDefrag. © J.C. Kessels
What We Like
  • Includes plenty of advanced options

  • Works "out of the box" for people who don't want to customize anything

  • The interface is really simple and to the point

  • Able to defrag removable drives and internal ones

What We Don't Like
  • Can be much harder to use than similar programs

  • Doesn't work from within Explorer like some defrag tools

  • Last updated in 2010

MyDefrag (formerly JkDefrag) can be both a simple and a rather complex defrag program depending on your needs.

It works be loading and running scripts on one or more drives. Several scripts are included when you first install it, like to defrag on a schedule, analyze a drive, and consolidate free space. The default install is just fine for regular users.

More advanced users can build their own custom scripts, which can actually be very detailed to deeply customize the way MyDefrag works. Information about creating scripts can be found in the online manual.

MyDefrag hasn't been updated since 2010, so it only officially supports Windows 7, Vista, XP, 2000, Server 2008, and Server 2003. However, it still works with newer versions of Windows, like Windows 11, 10, and 8.

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Screenshot of SpeeDefrag v7.1
SpeeDefrag v7.1.
What We Like
  • Helps the built-in Disk Defragmenter tool run more quickly

  • Very simple to use with easy-to-understand options

  • Lets you defrag the drive even if there's little free space remaining

What We Don't Like
  • Only relevant for users running Windows Vista or XP

  • Doesn't include common features found in most defrag tools

  • Depending on the defrag option you choose, all of your open programs and files will promptly shut down

  • Tries to install another program during setup

SpeeDefrag isn't actually a defrag program in and of itself. Instead, it shuts down everything you're using except for the built-in defragmenting program provided by Windows (listed below).

The purpose of SpeeDefrag is to speed up the regular defrag functions of Windows Disk Defragmenter. By shutting down unnecessary programs, it can utilize more system resources to make the defrag tool run quicker.

After installing SpeeDefrag, you're given a few options for how you want the task to run. For instance, you can choose to restart and run a defrag and then restart again automatically, or just to run a defrag and then shut down the computer.

Some features are only available in operating systems prior to Windows 7, such as restarting before a defrag and shutting down open programs. This means that this program is really only useful for Windows Vista and XP.

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Disk Defragmenter

Screenshot of Disk Defragmenter in Windows 7
Disk Defragmenter.
What We Like
  • Built-in to Windows; no installation necessary

  • Easy to use

  • Can run defrags on a schedule

  • Defrags internal and external drives

What We Don't Like
  • Can't defragment locked files (i.e., no boot time defrag option)

  • Finding the program is different depending on your version of Windows

Disk Defragmenter is the defrag program that already exists in Windows, which means you don't need to download anything to use it. You can set schedules and defragment both internal and external hard drives.

Many of the other defrag programs from this list have many advantages over Disk Defragmenter, such as boot time defrags and optimization features. If using this program, we suggest you couple it with the SpeeDefrag program from above.

Disk Defragmenter can be opened from Administrative Tools in the Control Panel (called Windows Tools in Windows 11). For Windows 7 and older versions of Windows, it can be found through the start menu by navigating to All Programs > Accessories > System Tools > Disk Defragmenter.

It's also available from the command line with the defrag command.

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Baidu PC Faster's Disk Defrag

Screenshot of Baidu PC Faster's hard drive defrag program
Baidu Disk Defrag.
What We Like
  • Very easy to use

  • Defrags internal and external drives

  • Can defragment multiple drives consecutively

  • Includes lots of other, non-defrag tools

What We Don't Like
  • Missing standard features like scheduling

  • The other included mini programs are overwhelming if you need just the defrag tool

  • The program no longer gets updated

Baidu Disk Defrag is a tool provided by Baidu PC Faster, which is a system optimizer program. While it's quick and super easy to use, it doesn't provide any custom or advanced features like scheduling or boot time defrags.

After analyzing one or more drives, you can select all of them at once so that it will defragment the first one, then the second, and so on.

Open the defrag program from Toolbox > Disk Defrag.

Baidu's PC Faster tool should work with Windows 11, 10, 8, 7, Vista, and XP.

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Wise Care 365

Screenshot of Wise Care 365 v3.9.2 in Windows 10
Wise Care 365.
What We Like
  • Supports optimizing and defragmenting the drive

  • Lets you enable an automatic shutdown for when the defrag finishes

  • There's a portable option

  • Includes other programs you might like

What We Don't Like
  • Can't defrag on a schedule

  • There are lots of other programs in addition to the defrag tool

  • Won't defragment locked files

Wise Care 365 is a collection of system utilities that scans for privacy issues and junk files. One of the tools, in the System Tuneup tab, is used for defragmenting a hard drive.

Select the drive to defragment and then choose Defragment, Full Optimization or Analyze. You can optionally shut down the computer after the defrag has finished. Scheduling defrags with Wise Care 365 is not supported.

A portable version is available from within the program (this is explained in the review).

Something we don't like is that a small advertisement about the full version of the program is always displayed in Wise Care 365. Also, some features and options are only available in the professional version.

Wise Care 365 can be installed on Windows 11, 10, 8, 7, Vista, and XP.

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