O&O Defrag Free Edition v14.1

A Full Review of O&O Defrag, a Free Defrag Program

O&O Defrag may look like a full-fledged defragmentation program, but it's rather simple and lacks many features found in similar programs.

Don't get me wrong, it can still be used for basic defragmentation tasks. It allows a defrag to run when the computer goes idle and supports scheduled scans—both nice features.

This review is of O&O Defrag version 14.1. Please let us know if there's a newer version we need to review.

More About O&O Defrag

O&O Defrag Free Edition
  • Works with 32-bit and 64-bit versions of Windows 7, Windows Vista, and Windows XP
  • Defrags can be scheduled to run when the screensaver turns on
  • O&O Defrag can correct fragmented files and merge together free space
  • The files that make up system restore points are automatically moved to a ​slower portion of the disk because they're hardly ever used
  • Defrags can run on a weekly, bi-weekly, every three weeks, or monthly schedule at any day of the week and any time of the day
  • A backup job can be repeated automatically every so many minutes, hours, and/or days
  • Scheduled defrags can be disabled from running if defragmentation is below a certain percentage
  • Hard drives shown in O&O Defrag can optionally be automatically checked for errors before running a defrag, and if errors are found the defrag will not start
  • Solid state drives are automatically hidden so you don't accidentally defrag them
  • A very detailed report can be created for any drive to show advanced hard drive details as well as all the files that contain the most fragments, the files with the largest fragments, the largest metafiles, the most heavily fragmented locked files, and a list of the largest locked files, among other details
  • Quick configuration makes it easy to setup scheduling or perform a defrag immediately

O&O Defrag Pros & Cons

O&O Defrag is a basic defrag program that's missing many features:


  • Can run defrags when the computer isn't being used (idle)
  • Supports scheduled defrags
  • Drives can be checked for errors using the chkdsk command
  • Setup doesn't try to install any unnecessary programs


  • Several features work only in the full version
  • Can't exclude certain files from being defragged
  • No boot time defrag options
  • Removable drives can't be defragged
  • Only one defrag job can exist at once
  • Doesn't work correctly on Windows 10 or Windows 8

Our Thoughts on O&O Defrag

O&O Defrag would be a wonderful program if there weren't also a professional version available. Because of this, many of the features aren't actually usable unless you have the full version. This means you'll likely find yourself trying to enable an option or use a feature that doesn't work because it's in the free version.

Nearly all of the tools that are missing in O&O Defrag and only available in its professional paid version are available absolutely free in competing defrag tools like Defraggler and Smart Defrag. For example, context menu integration, excluding files/folders from a defrag, a portable version, free space defragmentation, Windows 10 and 8 support, flash drive defragging, and multiple defrag jobs are all supported in some other free programs.

Overall, though, if you like the features it does support (like idle scans and error checking), you don't need anything fancy, and you aren't quickly annoyed by all the unusable features, O&O Defrag will work just fine for defragging a hard drive—We just wouldn't make it our first choice.

There are two download links for O&O Defrag Free Edition—for a 32-bit and a 64-bit version. See How to Tell If You Have Windows 32-bit or 64-bit to know which download link to choose. Be sure to choose one of the "Softpedia Secure Download" links from the download page.